:: Polish Notation
:: by Taneli Huuskonen
::
:: Received April 30, 2015
:: Copyright (c) 2015-2017 Association of Mizar Users
:: (Stowarzyszenie Uzytkownikow Mizara, Bialystok, Poland).
:: This code can be distributed under the GNU General Public Licence
:: version 3.0 or later, or the Creative Commons Attribution-ShareAlike
:: License version 3.0 or later, subject to the binding interpretation
:: detailed in file COPYING.interpretation.
:: See COPYING.GPL and COPYING.CC-BY-SA for the full text of these
:: licenses, or see http://www.gnu.org/licenses/gpl.html and
:: http://creativecommons.org/licenses/by-sa/3.0/.
environ
vocabularies NUMBERS, SUBSET_1, XBOOLE_0, FINSEQ_1, XXREAL_0, TARSKI, ARYTM_3,
CARD_1, ORDINAL4, FUNCT_1, RELAT_1, NAT_1, POLNOT_1, PRE_POLY, ZFMISC_1,
PROB_2, PARTFUN1, QC_LANG1, XCMPLX_0, SETFAM_1, BINOP_1, CQC_LANG;
notations TARSKI, XBOOLE_0, SUBSET_1, NAT_1, SETFAM_1, NUMBERS, FINSEQ_1,
XXREAL_0, XCMPLX_0, RELAT_1, FUNCT_1, PARTFUN1, ORDINAL1, ZFMISC_1,
PROB_2, BINOP_1, FUNCT_2;
constructors PRE_POLY, RELSET_1, PROB_2, SETFAM_1;
registrations ORDINAL1, XREAL_0, FINSEQ_1, SUBSET_1, RELAT_1, XBOOLE_0,
FUNCT_1, NAT_1, CARD_1, SETFAM_1, RELSET_1;
requirements NUMERALS, SUBSET, BOOLE, ARITHM, REAL;
definitions TARSKI, FINSEQ_1;
expansions TARSKI, FINSEQ_1, XBOOLE_0;
theorems TARSKI, FUNCT_1, FINSEQ_1, XBOOLE_0, XBOOLE_1, FUNCT_2, ORDINAL1,
NAT_1, PROB_2, FINSEQ_2, PARTFUN1, XTUPLE_0, SETFAM_1, ZFMISC_1,
XXREAL_0, BINOP_1, FUNCT_3;
schemes NAT_1, RECDEF_1, XBOOLE_0, FUNCT_2, FINSEQ_1, BINOP_1, FINSEQ_2;
begin :: Preliminaries
reserve k,m,n for Nat,
a, b, c, c1, c2 for object,
x, y, z, X, Y, Z for set,
D for non empty set;
reserve p, q, r, s, t, u, v for FinSequence;
reserve P, Q, R, P1, P2, Q1, Q2, R1, R2 for FinSequence-membered set;
reserve S, T for non empty FinSequence-membered set;
::
:: String and Set Operations for Polish Notation
::
definition
let D be non empty set;
let P, Q be Subset of (D*);
func ^(D, P, Q) -> Subset of (D*) equals
{p^q where p is FinSequence of D, q is FinSequence of D
: p in P & q in Q};
coherence
proof
set R = {p^q where p is FinSequence of D, q is FinSequence of D
: p in P & q in Q};
R c= D*
proof
let a;
assume a in R;
then consider p being FinSequence of D, q being FinSequence of D
such that A2: a = p^q & p in P & q in Q;
thus thesis by A2, FINSEQ_1:def 11;
end;
hence thesis;
end;
end;
definition
let P, Q;
func P^Q -> FinSequence-membered set means
:Def2:
for a holds a in it iff ex p, q st a = p^q & p in P & q in Q;
existence
proof
set E = P \/ Q;
E is FinSequence-membered
proof
let a;
assume A1: a in E;
A2: a in P implies thesis;
a in Q implies thesis;
hence thesis by A1, A2, XBOOLE_0:def 3;
end;
then consider D such that A1: E c= D* by FINSEQ_1:85;
P c= E & Q c= E by XBOOLE_1:7;
then A3: P c= D* & Q c= D* by A1;
defpred X[ object ] means ex p, q st $1 = p^q & p in P & q in Q;
consider Y such that A4: for a holds a in Y iff a in D* & X[ a ]
from XBOOLE_0:sch 1;
for a st a in Y holds a is FinSequence
proof
let a;
assume a in Y;
then a in D* by A4;
hence thesis;
end;
then reconsider Y as FinSequence-membered set by FINSEQ_1:def 18;
take Y;
for a holds a in Y iff X[ a ]
proof
let a;
thus a in Y implies X[ a ] by A4;
assume A5: X[ a ];
then consider p, q such that
A6: a = p^q and
A7: p in P and
A8: q in Q;
reconsider p1 = p as FinSequence of D by A3, A7, FINSEQ_1:def 11;
reconsider q1 = q as FinSequence of D by A3, A8, FINSEQ_1:def 11;
p1^q1 is FinSequence of D;
then a in D* by A6, FINSEQ_1:def 11;
hence a in Y by A4, A5;
end;
hence thesis;
end;
uniqueness
proof
let R1, R2;
defpred X[ object ] means ex p,q st $1 = p^q & p in P & q in Q;
assume that
A1: for a holds a in R1 iff X[ a ] and
A2: for a holds a in R2 iff X[ a ];
thus R1 = R2 from XBOOLE_0:sch 2(A1, A2);
end;
end;
registration
let E be empty set;
let P;
cluster E^P -> empty;
coherence
proof
assume not E^P is empty;
then consider a such that A1: a in E^P;
consider p, q such that a = p^q and A2: p in E and q in P by A1, Def2;
thus thesis by A2;
end;
cluster P^E -> empty;
coherence
proof
assume not P^E is empty;
then consider a such that A1: a in P^E;
consider p, q such that a = p^q & p in P and A2: q in E by A1, Def2;
thus thesis by A2;
end;
end;
registration
let S, T;
cluster S^T -> non empty;
coherence
proof
consider a such that A1: a in S by XBOOLE_0:def 1;
reconsider a as FinSequence by A1;
consider b such that A2: b in T by XBOOLE_0:def 1;
reconsider b as FinSequence by A2;
a^b in S^T by A1, A2, Def2;
hence thesis;
end;
end;
theorem TH1:
for p,q,r,s st p^q = r^s ex t st p^t = r or p = r^t
proof
let p, q, r, s;
assume A1: p^q = r^s;
per cases;
suppose len p <= len r;
then consider u such that A2: p^u = r by A1, FINSEQ_1:47;
take u;
thus thesis by A2;
end;
suppose len p > len r;
then consider u such that A3: r^u = p by A1, FINSEQ_1:47;
take u;
thus thesis by A3;
end;
end;
theorem Th2:
for P, Q, R holds (P^Q)^R = P^(Q^R)
proof
let P, Q, R;
for a holds a in (P^Q)^R iff a in P^(Q^R)
proof
let a;
thus a in (P^Q)^R implies a in P^(Q^R)
proof
assume a in (P^Q)^R;
then consider u,r such that A2: a = u^r and A3: u in P^Q and A4: r in R
by Def2;
consider p, q such that A5: u = p^q and A6: p in P and A7: q in Q
by A3, Def2;
A8: a = p^(q^r) by A2, A5, FINSEQ_1:32;
q^r in (Q^R) by A4, A7, Def2;
hence a in P^(Q^R) by A6, A8, Def2;
end;
assume a in P^(Q^R);
then consider p,t such that A9: a = p^t and A10: p in P and A11: t in Q^R
by Def2;
consider q,r such that A12: t = q^r and A13: q in Q and A14: r in R
by A11, Def2;
A15: a = (p^q)^r by A9, A12, FINSEQ_1:32;
p^q in (P^Q) by A10, A13, Def2;
hence a in (P^Q)^R by A14, A15, Def2;
end;
hence thesis by TARSKI:2;
end;
registration
cluster {{}} -> non empty FinSequence-membered;
coherence by TARSKI:def 1;
end;
theorem Th3:
for P holds P^{{}} = P & {{}}^P = P
proof
let P;
A1: for a holds a in P^{{}} iff a in P
proof
let a;
thus a in P^{{}} implies a in P
proof
assume a in P^{{}};
then consider p, q such that
A2: a = p^q and A3: p in P and A4: q in {{}} by Def2;
q = {} by A4, TARSKI:def 1;
hence thesis by A2, A3, FINSEQ_1:34;
end;
assume A10: a in P;
then reconsider a as FinSequence;
{} in {{}} by TARSKI:def 1;
then a^{} in P^{{}} by A10, Def2;
hence thesis by FINSEQ_1:34;
end;
for a holds a in {{}}^P iff a in P
proof
let a;
thus a in {{}}^P implies a in P
proof
assume a in {{}}^P;
then consider q, p such that
A12: a = q^p and A13: q in {{}} and A14: p in P by Def2;
q = {} by A13, TARSKI:def 1;
hence thesis by A12, A14, FINSEQ_1:34;
end;
assume A20: a in P;
then reconsider a as FinSequence;
{} in {{}} by TARSKI:def 1;
then {}^a in {{}}^P by A20, Def2;
hence thesis by FINSEQ_1:34;
end;
hence thesis by A1, TARSKI:2;
end;
definition
let P;
func P^^ -> Function means
:Def3:
dom it = NAT & it.0 = {{}} & for n holds ex Q st Q = it.n & it.(n+1) = Q^P;
existence
proof
consider D such that A0: P c= D* by FINSEQ_1:85;
set E = bool (D*);
reconsider E as non empty set;
set W = {<*>D};
W c= D*
proof
let a;
assume a in W;
then a = <*>D by TARSKI:def 1;
hence thesis by FINSEQ_1:def 11;
end;
then reconsider W as Element of E;
defpred S[set, set, set] means
ex Q st $2 = Q & $3 = Q^P;
A2: for n being Nat for Q being Element of E
ex R being Element of E st S[n, Q, R]
proof
let n be Nat, Q be Element of E;
reconsider Q as FinSequence-membered set;
set R = Q^P;
R c= D*
proof
let a;
assume a in R;
then consider p, q such that A3: a = p^q & p in Q & q in P by Def2;
reconsider p as FinSequence of D by FINSEQ_1:def 11, A3;
reconsider q as FinSequence of D by FINSEQ_1:def 11, A3, A0;
p^q is FinSequence of D;
then reconsider a as FinSequence of D by A3;
a in D* by FINSEQ_1:def 11;
hence thesis;
end;
then reconsider R as Element of E;
take R;
thus thesis;
end;
consider f being sequence of E such that
A14: f.0 = W and
A15: for n being Nat holds S[n, f.n, f.(n+1)] from RECDEF_1:sch 2(A2);
take f;
thus thesis by A14, A15, FUNCT_2:def 1;
end;
uniqueness
proof
let f,g be Function;
assume that
A1: dom f = NAT and
A2: f.0 = {{}} and
A3: for n holds ex Q st Q = f.n & f.(n+1) = Q^P and
A4: dom g = NAT and
A5: g.0 = {{}} and
A6: for n holds ex Q st Q = g.n & g.(n+1) = Q^P;
defpred S[ Nat ] means f.$1 = g.$1;
A15: S[0] by A2, A5;
A16: for n st S[ n ] holds S[ n + 1 ]
proof
let n;
assume A17: S[ n ];
consider Q such that A18: Q = f.n & f.(n+1) = Q^P by A3;
consider R such that A19: R = g.n & g.(n+1) = R^P by A6;
thus thesis by A17, A18, A19;
end;
for n holds S[ n ] from NAT_1:sch 2(A15, A16);
then for a st a in dom f holds f.a = g.a by A1;
hence thesis by A1, A4, FUNCT_1:2;
end;
end;
definition
let P, n;
func P^^n -> FinSequence-membered set equals
P^^.n;
coherence
proof
consider Q such that A1: Q = P^^.n and P^^.(n+1) = Q^P by Def3;
thus thesis by A1;
end;
end;
theorem Th4:
for P holds {} in P^^0
proof
let P;
P^^0 = {{}} by Def3;
hence thesis by TARSKI:def 1;
end;
registration
let P;
let n be zero Nat;
cluster P^^n -> non empty;
coherence by Th4;
end;
registration
let E be empty set;
let n be non zero Nat;
cluster E^^n -> empty;
coherence
proof
consider k such that A1: k+1 = n by NAT_1:6;
consider Q such that Q = E^^k and A2: E^^n = Q^E by Def3, A1;
thus thesis by A2;
end;
end;
definition
let P;
func P* -> non empty FinSequence-membered set equals
union the set of all P^^n where n is Nat;
coherence
proof
set X = the set of all P^^n where n is Nat;
set U = union X;
for a st a in U holds a is FinSequence
proof
let a;
assume a in U;
then consider Y such that A3: a in Y and A4: Y in X by TARSKI:def 4;
consider n such that A5: Y = P^^n by A4;
thus thesis by A3, A5;
end;
then A1: U is FinSequence-membered;
{} in P^^0 & P^^0 in X by Th4;
hence thesis by A1, TARSKI:def 4;
end;
end;
theorem Th6:
for P, a holds a in P* iff ex n st a in P^^n
proof
let P, a;
set X = the set of all P^^n where n is Nat;
thus a in P* implies ex n st a in P^^n
proof
assume a in P*;
then consider Y such that A1: a in Y and A2: Y in X by TARSKI:def 4;
consider n such that A3: Y = P^^n by A2;
take n;
thus thesis by A1, A3;
end;
given n such that A4: a in P^^n;
P^^n in X;
hence thesis by A4, TARSKI:def 4;
end;
theorem Th7:
for P holds P^^0 = {{}} & for n holds P^^(n+1) = (P^^n)^P
proof
let P;
thus P^^0 = {{}} by Def3;
let n;
consider Q such that A1: Q = P^^n & P^^(n+1) = Q^P by Def3;
thus thesis by A1;
end;
theorem Th8:
for P holds P^^1 = P
proof
let P;
thus P^^1 = P^^(0+1) .= (P^^0)^P by Th7 .= {{}}^P by Th7 .= P by Th3;
end;
theorem Th9:
for P, n holds P^^n c= P* by Th6;
theorem Th10:
for P holds {} in P* & P c= P*
proof
let P;
{} in P^^0 by Th4;
hence {} in P* by Th6;
P^^1 = P by Th8;
hence thesis by Th6;
end;
theorem Th11:
for P, m, n holds P^^(m+n) = (P^^m)^(P^^n)
proof
let P, m;
defpred X[ Nat ] means P^^(m+$1) = (P^^m)^(P^^$1);
A1: X[ 0 ]
proof
thus P^^(m+0) = (P^^m)^{{}} by Th3 .= (P^^m)^(P^^0) by Th7;
end;
A20: for k holds X[ k ] implies X[ k+1 ]
proof
let k;
assume A21: P^^(m+k) = (P^^m)^(P^^k);
thus P^^(m+(k+1)) = P^^((m+k)+1)
.= ((P^^m)^(P^^k))^P by Th7, A21
.= (P^^m)^((P^^k)^P) by Th2
.= (P^^m)^(P^^(k+1)) by Th7;
end;
for k holds X[ k ] from NAT_1:sch 2(A1, A20);
hence thesis;
end;
theorem Th12:
for P, p, q, m, n st p in P^^m & q in P^^n holds p^q in P^^(m+n)
proof
let P, p, q, m, n;
assume p in P^^m & q in P^^n;
then p^q in (P^^m)^(P^^n) by Def2;
hence thesis by Th11;
end;
theorem Th13:
for P, p, q st p in P* & q in P* holds p^q in P*
proof
let P, p, q;
assume that A1: p in P* and A2: q in P*;
consider m such that A3: p in P^^m by A1, Th6;
consider n such that A4: q in P^^n by A2, Th6;
p^q in P^^(m+n) by Th12, A3, A4;
hence thesis by Th6;
end;
theorem Th14:
for P, Q, R st P c= R* & Q c= R* holds P^Q c= R*
proof
let P, Q, R;
assume that A1: P c= R* and A2: Q c= R*;
let a;
assume a in P^Q;
then consider p, q such that A3: a = p^q and A4: p in P and A5: q in Q
by Def2;
thus thesis by A1, A2, A3, A4, A5, Th13;
end;
theorem Th15:
for P, Q, n st Q c= P* holds Q^^n c= P*
proof
let P, Q, n;
assume A1: Q c= P*;
defpred X[ Nat ] means Q^^$1 c= P*;
A2: X[ 0 ]
proof
Q^^0 = {{}} by Th7 .= P^^0 by Th7;
hence thesis by Th9;
end;
A3: for k holds X[ k ] implies X[ k+1 ]
proof
let k;
assume X[ k ];
then (Q^^k)^Q c= P* by A1, Th14;
hence thesis by Th7;
end;
for k holds X[ k ] from NAT_1:sch 2(A2, A3);
hence thesis;
end;
theorem
for P, Q st Q c= P* holds Q* c= P*
proof
let P, Q;
assume A1: Q c= P*;
let a;
assume a in Q*;
then consider n such that A2: a in Q^^n by Th6;
Q^^n c= P* by Th15, A1;
hence thesis by A2;
end;
theorem Th17:
for P1, P2, Q1, Q2 st P1 c= P2 & Q1 c= Q2 holds P1^Q1 c= P2^Q2
proof
let P1, P2, Q1, Q2;
assume A1: P1 c= P2 & Q1 c= Q2;
let a;
assume a in P1^Q1;
then consider p, q such that A3: a = p^q & p in P1 & q in Q1 by Def2;
thus thesis by A1, A3, Def2;
end;
theorem TH18:
for P, Q st P c= Q for n holds P^^n c= Q^^n
proof
let P, Q;
assume A1: P c= Q;
defpred S[ Nat ] means P^^$1 c= Q^^$1;
P^^0 = {{}} by Th7 .= Q^^0 by Th7;
then A2: S[ 0 ];
A3: for n holds S[ n ] implies S[ n + 1 ]
proof
let n;
assume A4: S[ n ];
A5: P^^(n+1) = (P^^n)^P by Th7;
Q^^(n+1) = (Q^^n)^Q by Th7;
hence thesis by A1, A4, A5, Th17;
end;
for n holds S[ n ] from NAT_1:sch 2(A2, A3);
hence thesis;
end;
registration
let S, n;
cluster S^^n -> non empty FinSequence-membered;
coherence
proof
defpred X[ Nat ] means S^^$1 is non empty;
A1: X[ 0 ];
A2: for k holds X[ k ] implies X[ k + 1 ]
proof
let k;
set T = S^^k;
assume T is non empty;
then reconsider T as non empty FinSequence-membered set;
S^^(k+1) = T^S by Th7;
hence thesis;
end;
for k holds X[ k ] from NAT_1:sch 2(A1, A2);
hence thesis;
end;
end;
begin :: The Language
reserve A for Function of P, NAT;
reserve U, V, W for Subset of P*;
definition
let P, A, U;
func Polish-expression-layer(P, A, U) -> Subset of P* means
:Def8:
for a holds a in it
iff a in P* & ex p, q, n st a = p^q & p in P & n = A.p & q in U^^n;
existence
proof
defpred X[ object ] means
$1 in P* & ex p, q, n st $1 = p^q & p in P & n = A.p & q in U^^n;
consider Y being set such that
A1: for a holds a in Y iff a in P* & X[ a ] from XBOOLE_0:sch 1;
Y c= P* by A1;
then reconsider Y as Subset of P*;
take Y;
thus thesis by A1;
end;
uniqueness
proof
defpred X[ object ] means
$1 in P* & ex p, q, n st $1 = p^q & p in P & n = A.p & q in U^^n;
let Y1, Y2 be Subset of P*;
assume that
A1: for a holds a in Y1 iff X[ a ] and
A2: for a holds a in Y2 iff X[ a ];
thus thesis from XBOOLE_0:sch 2(A1, A2);
end;
end;
theorem Th20:
for P, A, U, n, p, q st p in P & n = A.p & q in U^^n holds
p^q in Polish-expression-layer(P, A, U)
proof
let P, A, U, n, p, q;
set r = p^q;
assume that
A1: p in P and
A2: n = A.p and
A3: q in U^^n;
A4: q in P* by A3, Th15, TARSKI:def 3;
p in P* by A1, Th10, TARSKI:def 3;
then r in P* by A4, Th13;
hence thesis by A1, A2, A3, Def8;
end;
definition
let P, A;
func Polish-atoms(P, A) -> Subset of P* means
:Def9:
for a holds a in it iff a in P & A.a = 0;
existence
proof
defpred X[ object ] means A.$1 = 0;
consider Y such that A1: for a holds a in Y iff a in P & X[ a ]
from XBOOLE_0:sch 1;
Y c= P & P c= P* by A1, Th10;
then Y c= P*;
then reconsider Y as Subset of P*;
take Y;
thus thesis by A1;
end;
uniqueness
proof
defpred X[ object ] means $1 in P & A.$1 = 0;
let Y1, Y2 be Subset of P* such that
A1: for a holds a in Y1 iff X[ a ] and
A2: for a holds a in Y2 iff X[ a ];
thus Y1 = Y2 from XBOOLE_0:sch 2(A1, A2);
end;
func Polish-operations(P, A) -> Subset of P equals
{t where t is Element of P* : t in P & A.t <> 0};
coherence
proof
set Q = {t where t is Element of P* : t in P & A.t <> 0};
Q c= P
proof
let a;
assume a in Q;
then consider t being Element of P* such that
A1: a = t and A2: t in P and A.t <> 0;
thus thesis by A1, A2;
end;
hence thesis;
end;
end;
theorem Th26:
for P, A, U holds Polish-atoms(P, A) c= Polish-expression-layer(P, A, U)
proof
let P, A, U;
set X = Polish-atoms(P, A);
set Y = Polish-expression-layer(P, A, U);
let a;
assume A1: a in X;
then reconsider p = a as FinSequence;
set q = <*>P;
A3: q in U^^0 by Th4;
p in P & A.p = 0 by A1, Def9; then
p^q in Y by A3, Th20;
hence thesis by FINSEQ_1:34;
end;
theorem Th27:
for P, A, U, V st U c= V holds
Polish-expression-layer(P, A, U) c= Polish-expression-layer(P, A, V)
proof
let P, A, U, V;
assume A1: U c= V;
let a;
assume A2: a in Polish-expression-layer(P, A, U);
then consider p, q, n such that
A4: a = p^q & p in P & n = A.p & q in U^^n by Def8;
U^^n c= V^^n by A1, TH18;
hence thesis by A2, A4, Def8;
end;
theorem TH21:
for P, A, U, u st u in Polish-expression-layer(P, A, U)
ex p, q st p in P & u = p^q
proof
let P, A, U, u;
assume u in Polish-expression-layer(P, A, U);
then consider p, q, n such that
A1: u = p^q & p in P and
n = A.p & q in U^^n by Def8;
thus thesis by A1;
end;
definition
let P, A;
func Polish-expression-hierarchy(P, A) -> Function means :Def10:
dom it = NAT & it.0 = Polish-atoms(P, A)
& for n holds ex U st U = it.n &
it.(n+1) = Polish-expression-layer(P, A, U);
existence
proof
set X = bool(P*);
set Y = Polish-atoms(P, A);
reconsider Y as Element of X;
defpred S1[set, set, set] means
$2 is Subset of P*
implies ex V st $2 = V & $3 = Polish-expression-layer(P, A, V);
A2: for n being Nat, U being Element of X
ex W being Element of X st S1[n, U, W]
proof
let n be Nat, U be Element of X;
reconsider U as Subset of P*;
set W = Polish-expression-layer(P, A, U);
reconsider W as Element of X;
take W;
thus thesis;
end;
consider f being sequence of X such that
A14: f.0 = Y and
A15: for n being Nat holds S1[n, f.n, f.(n+1)]
from RECDEF_1:sch 2(A2);
take f;
defpred S2[ Nat ] means f.$1 is Subset of P*;
A20: S2[ 0 ] by A14;
A21: for k holds S2[ k ] implies S2[ k + 1 ]
proof
let k;
assume S2[ k ];
then consider V such that
f.k = V and
A24: f.(k+1) = Polish-expression-layer(P, A, V) by A15;
thus thesis by A24;
end;
A26: for k holds S2[ k ] from NAT_1:sch 2(A20, A21);
for n holds ex U st U = f.n & f.(n+1) = Polish-expression-layer(P, A, U)
proof
let n;
f.n is Subset of P* by A26;
then consider V such that
A28: f.n = V and
A29: f.(n+1) = Polish-expression-layer(P, A, V) by A15;
take V;
thus thesis by A28, A29;
end;
hence thesis by A14, FUNCT_2:def 1;
end;
uniqueness
proof
let f, g be Function;
assume that
A1: dom f = NAT and
A2: f.0 = Polish-atoms(P, A) and
A3: for n ex U st U = f.n &
f.(n+1) = Polish-expression-layer(P, A, U) and
A4: dom g = NAT and
A5: g.0 = Polish-atoms(P, A) and
A6: for n ex U st U = g.n & g.(n+1) = Polish-expression-layer(P, A, U);
defpred S[ Nat ] means f.$1 = g.$1;
A10: S[ 0 ] by A2, A5;
A11: for k holds S[ k ] implies S[ k + 1 ]
proof
let k;
assume A12: S[ k ];
consider U such that A13: U = f.k
and A14: f.(k+1) = Polish-expression-layer(P, A, U) by A3;
consider V such that A15: V = g.k
and A16: g.(k+1) = Polish-expression-layer(P, A, V) by A6;
thus thesis by A12, A13, A14, A15, A16;
end;
for k holds S[ k ] from NAT_1:sch 2(A10, A11);
then for a st a in dom f holds f.a = g.a by A1;
hence thesis by A1, A4, FUNCT_1:2;
end;
end;
definition
let P, A, n;
func Polish-expression-hierarchy(P, A, n) -> Subset of P* equals
Polish-expression-hierarchy(P, A).n;
coherence
proof
consider U such that A1: U = Polish-expression-hierarchy(P, A).n
and Polish-expression-hierarchy(P, A).(n+1)
= Polish-expression-layer(P, A, U) by Def10;
thus thesis by A1;
end;
end;
theorem TH22:
for P, A holds Polish-expression-hierarchy(P, A, 0) = Polish-atoms(P, A)
by Def10;
theorem Th31:
for P, A, n holds Polish-expression-hierarchy(P, A, n+1)
= Polish-expression-layer(P, A, Polish-expression-hierarchy(P, A, n))
proof
let P, A, n;
consider U such that
A1: U = Polish-expression-hierarchy(P, A, n) and
A2: Polish-expression-hierarchy(P, A, n+1)
= Polish-expression-layer(P, A, U) by Def10;
thus thesis by A1, A2;
end;
theorem Th33:
for P, A, n holds
Polish-expression-hierarchy(P, A, n)
c= Polish-expression-hierarchy(P, A, n+1)
proof
let P, A, n;
defpred S[ Nat ] means
Polish-expression-hierarchy(P, A, $1)
c= Polish-expression-hierarchy(P, A, $1+1);
A1: S[ 0 ]
proof
set U = Polish-expression-hierarchy(P, A, 0);
set V = Polish-expression-hierarchy(P, A, 1);
A3: V = Polish-expression-hierarchy(P, A, 0+1)
.= Polish-expression-layer(P, A, U) by Th31;
U = Polish-atoms(P, A) by Def10;
hence thesis by A3, Th26;
end;
A10: for k holds S[ k ] implies S[ k + 1 ]
proof
let k;
assume A11: S[ k ];
set U = Polish-expression-hierarchy(P, A, k);
set V = Polish-expression-hierarchy(P, A, (k+1));
A13: Polish-expression-hierarchy(P, A, k+1)
= Polish-expression-layer(P, A, U) by Th31;
Polish-expression-hierarchy(P, A, k+1+1)
= Polish-expression-layer(P, A, V) by Th31;
hence thesis by A11, A13, Th27;
end;
for k holds S[ k ] from NAT_1:sch 2(A1, A10);
hence thesis;
end;
theorem Th34:
for P, A, n, m holds
Polish-expression-hierarchy(P, A, n)
c= Polish-expression-hierarchy(P, A, n+m)
proof
let P, A, n, m;
defpred S[ Nat] means
Polish-expression-hierarchy(P, A, n)
c= Polish-expression-hierarchy(P, A, n+$1);
A1: S[ 0 ];
A2: for k holds S[ k ] implies S[ k + 1 ]
proof
let k;
assume A3: S[ k ];
Polish-expression-hierarchy(P, A, n+k)
c= Polish-expression-hierarchy(P, A, n+k+1) by Th33;
hence thesis by A3, XBOOLE_1:1;
end;
for k holds S[ k ] from NAT_1:sch 2(A1, A2);
hence thesis;
end;
definition
let P, A;
func Polish-expression-set(P, A) -> Subset of P* equals
union the set of all Polish-expression-hierarchy(P, A, n) where n is Nat;
coherence
proof
set X = the set of all Polish-expression-hierarchy(P, A, n) where n is Nat;
set Y = union X;
Y c= P*
proof
let a;
assume a in Y;
then consider Z such that A1: a in Z and A2: Z in X by TARSKI:def 4;
consider n such that A3: Z = Polish-expression-hierarchy(P, A, n) by A2;
thus thesis by A1, A3;
end;
hence thesis;
end;
end;
theorem Th35:
for P, A, n holds Polish-expression-hierarchy(P, A, n)
c= Polish-expression-set(P, A)
proof
let P, A, n;
set Q = Polish-expression-hierarchy(P, A, n);
set X = the set of all Polish-expression-hierarchy(P, A, m) where m is Nat;
let a;
assume A1: a in Q;
Q in X;
hence thesis by A1, TARSKI:def 4;
end;
theorem Th36:
for P, A, n, q st q in (Polish-expression-set(P, A))^^n
ex m st q in (Polish-expression-hierarchy(P, A, m))^^n
proof
let P, A;
defpred S[ Nat ] means
for q st q in (Polish-expression-set(P, A))^^$1
ex m st q in (Polish-expression-hierarchy(P, A, m))^^$1;
A1: S[ 0 ]
proof
let q;
assume q in (Polish-expression-set(P, A))^^0;
then q in {{}} by Def3;
then q in (Polish-expression-hierarchy(P, A, 0))^^0 by Def3;
hence thesis;
end;
A2: for k holds S[ k ] implies S[ k + 1 ]
proof
let k;
assume A3: S[ k ];
set X = the set of all Polish-expression-hierarchy(P, A, n) where
n is Nat;
let q;
assume q in (Polish-expression-set(P, A))^^(k+1);
then q in ((Polish-expression-set(P, A))^^k)^
Polish-expression-set(P, A) by Th7;
then consider r, s such that
A6: q = r^s and A7: r in (Polish-expression-set(P, A))^^k and
A8: s in Polish-expression-set(P, A) by Def2;
consider m such that
A9: r in Polish-expression-hierarchy(P, A, m)^^k by A3, A7;
consider Y such that A10: s in Y and A11: Y in X by A8, TARSKI:def 4;
consider m1 being Nat such that
A12: Y = Polish-expression-hierarchy(P, A, m1) by A11;
A14: Polish-expression-hierarchy(P, A, m)^^k
c= Polish-expression-hierarchy(P, A, m+m1)^^k by TH18, Th34;
s in Polish-expression-hierarchy(P, A, m+m1)
by A10, A12, Th34, TARSKI:def 3;
then r^s in (Polish-expression-hierarchy(P, A, m+m1)^^k)
^Polish-expression-hierarchy(P, A,m+m1) by A9, A14, Def2;
then q in (Polish-expression-hierarchy(P, A, m+m1))^^(k+1) by A6, Th7;
hence thesis;
end;
for k holds S[ k ] from NAT_1:sch 2(A1, A2);
hence thesis;
end;
theorem Th37:
for P, A, a st a in Polish-expression-set(P, A)
ex n st a in Polish-expression-hierarchy(P, A, n+1)
proof
let P, A, a;
assume A1: a in Polish-expression-set(P, A);
set Y = the set of all Polish-expression-hierarchy(P, A, n) where
n is Nat;
consider X such that A2: a in X and A3: X in Y by A1, TARSKI:def 4;
consider n such that A4: X = Polish-expression-hierarchy(P, A, n) by A3;
Polish-expression-hierarchy(P, A, n)
c= Polish-expression-hierarchy(P, A, n+1) by Th33;
hence thesis by A2, A4;
end;
definition
let P, A;
mode Polish-expression of P, A is Element of Polish-expression-set(P, A);
end;
definition
let P, A, n, t;
assume A0: t in P;
func Polish-operation (P, A, n, t)
-> Function of (Polish-expression-set(P, A))^^n, P* means
:Def13:
for q st q in dom it holds it.q = t^q;
existence
proof
set R = Polish-expression-set(P, A);
set Q = R^^n;
defpred S[ object, object ] means ex p st p = $1 & $2 = t^p;
A10: for a st a in Q ex b st b in P* & S[a, b]
proof
let a;
assume A11: a in Q;
then reconsider a as FinSequence;
take b = t^a;
A12: Q c= P* by Th15;
t in P* by A0, Th10, TARSKI:def 3;
hence thesis by A11, A12, Th13;
end;
consider f being Function of Q, P* such that
A22: for a st a in Q holds S[a, f.a] from FUNCT_2:sch 1(A10);
A23: for q st q in Q holds f.q = t^q
proof
let q;
assume q in Q;
then S[q, f.q] by A22;
hence thesis;
end;
take f;
dom f = Q by FUNCT_2:def 1;
hence thesis by A23;
end;
uniqueness
proof
set R = Polish-expression-set(P, A);
set Q = R^^n;
let f,g be Function of Q, P*;
assume that
A1: for q st q in dom f holds f.q = t^q and
A2: for q st q in dom g holds g.q = t^q;
A3: dom f = Q by FUNCT_2:def 1;
then A4: dom f = dom g by FUNCT_2:def 1;
for a st a in dom f holds f.a = g.a
proof
let a;
assume A5: a in dom f;
then reconsider a as FinSequence by A3;
f.a = t^a by A1, A5 .= g.a by A2, A4, A5;
hence thesis;
end;
hence thesis by A4, FUNCT_1:2;
end;
end;
definition
let X, Y;
let F be PartFunc of X, bool Y;
redefine attr F is disjoint_valued means :Def21:
for a, b st a in dom F & b in dom F & a <> b holds F.a misses F.b;
compatibility
proof
thus F is disjoint_valued implies
for a, b st a in dom F & b in dom F & a <> b holds F.a misses F.b
by PROB_2:def 2;
assume
A1: for i,j be object st i in dom F & j in dom F & i <> j holds F.i misses F.j;
for x,y be object st x <> y holds F.x misses F.y
proof
let x,y be object;
assume
A2: x <> y;
per cases;
suppose
x in dom F & y in dom F;
hence thesis by A1,A2;
end;
suppose
not x in dom F;
then F.x = {} by FUNCT_1:def 2;
hence thesis;
end;
suppose
not y in dom F;
then F.y = {} by FUNCT_1:def 2;
hence thesis;
end;
end;
hence thesis by PROB_2:def 2;
end;
end;
registration
let X be set;
cluster disjoint_valued for FinSequence of bool X;
existence
proof
set p = <*> bool X;
p is disjoint_valued;
hence thesis;
end;
end;
theorem Th40:
for X being set for B being disjoint_valued FinSequence of bool X
for a, b, c st a in B.b & a in B.c holds b = c & b in dom B
proof
let X be set, B be disjoint_valued FinSequence of bool X,
a, b, c;
assume that A1: a in B.b and A2: a in B.c;
A3: b in dom B by A1, FUNCT_1:def 2;
A4: c in dom B by A2, FUNCT_1:def 2;
B.b meets B.c by A1, A2, XBOOLE_0:def 4;
hence thesis by A3, A4, Def21;
end;
definition
let X;
let B be disjoint_valued FinSequence of bool X;
func arity-from-list B -> Function of X, NAT means
:Def22:
for a st a in X holds
((ex n st a in B.n) & a in B.(it.a))
or ((not ex n st a in B.n) & it.a = 0);
existence
proof
defpred P[ object, object ] means
(((ex n st $1 in B.n) & $1 in B.$2)
or ((not ex n st $1 in B.n) & $2 = 0));
B1: for a st a in X ex b st b in NAT & P[a, b]
proof
let a;
assume a in X;
per cases;
suppose ex n st a in B.n;
then consider n such that B3: a in B.n;
take n;
thus thesis by B3, ORDINAL1:def 12;
end;
suppose B10: not ex n st a in B.n;
take 0;
thus thesis by B10, ORDINAL1:def 12;
end;
end;
consider f being Function of X, NAT such that
C2: for a st a in X holds P[a, f.a] from FUNCT_2:sch 1(B1);
take f;
thus thesis by C2;
end;
uniqueness
proof
let C1, C2 be Function of X, NAT;
assume that
A1: for a st a in X holds
((ex n st a in B.n) & a in B.(C1.a))
or ((not ex n st a in B.n) & C1.a = 0) and
A2: for a st a in X holds
((ex n st a in B.n) & a in B.(C2.a))
or ((not ex n st a in B.n) & C2.a = 0);
A4: dom C1 = X by FUNCT_2:def 1;
A5: dom C1 = dom C2 by FUNCT_2:def 1, A4;
for a st a in X holds C1.a = C2.a
proof
let a;
assume A6: a in X;
per cases;
suppose A11: ex n st a in B.n; then
A12: a in B.(C1.a) by A1, A6;
a in B.(C2.a) by A2, A6, A11;
hence thesis by A12, Th40;
end;
suppose A20: not ex n st a in B.n;
then C1.a = 0 by A1, A6 .= C2.a by A2, A6, A20;
hence thesis;
end;
end;
hence thesis by A4, A5, FUNCT_1:def 11;
end;
end;
theorem TH30:
for X for B being disjoint_valued FinSequence of bool X for a st a in X
holds (arity-from-list B).a <> 0 iff ex n st a in B.n
proof
let X;
let B be disjoint_valued FinSequence of bool X;
let a;
assume A1: a in X;
set F = arity-from-list B;
A2: ((ex n st a in B.n) & a in B.(F.a))
or ((not ex n st a in B.n) & F.a = 0) by A1, Def22;
thus F.a <> 0 implies ex n st a in B.n by A1,Def22;
assume ex n st a in B.n;
then A4: F.a in dom B by A2, Th40;
consider m being Nat such that A5: dom B = Seg m by FINSEQ_1:def 2;
thus F.a <> 0 by FINSEQ_1:1, A4, A5;
end;
theorem
for X for B being disjoint_valued FinSequence of bool X for a, n
st a in B.n holds (arity-from-list B).a = n
proof
let X;
let B be disjoint_valued FinSequence of bool X;
let a, n;
set F = arity-from-list B;
assume A2: a in B.n;
then n in dom B by Th40;
then A4: B.n in rng B by FUNCT_1:def 3;
rng B c= bool X by FINSEQ_1:def 4;
then a in B.(F.a) by A2, A4, Def22;
hence thesis by A2, Th40;
end;
theorem TH32:
for P, A, r st r in Polish-expression-set(P, A)
ex n, p, q
st p in P & n = A.p & q in Polish-expression-set(P, A)^^n & r = p^q
proof
let P, A, r;
assume r in Polish-expression-set(P, A);
then consider m such that A1: r in Polish-expression-hierarchy(P, A, m+1)
by Th37;
set U = Polish-expression-hierarchy(P, A, m);
r in Polish-expression-layer(P, A, U) by A1, Th31;
then consider p, q, n such that
A2: r = p^q and
A3: p in P and
A4: n = A.p and
A5: q in U^^n by Def8;
take n, p, q;
U^^n c= Polish-expression-set(P, A)^^n by Th35, TH18;
hence thesis by A2, A3, A4, A5;
end;
definition
let P, A, Q;
attr Q is A-closed means
for p, n, q st p in P & n = A.p & q in Q^^n holds p^q in Q;
end;
theorem TH51:
for P, A holds Polish-expression-set(P, A) is A-closed
proof
let P, A, p, n, q;
assume that
A1: p in P and
A2: n = A.p and
A3: q in Polish-expression-set(P, A)^^n;
consider m such that A4: q in Polish-expression-hierarchy(P, A, m)^^n
by A3, Th36;
set U = Polish-expression-hierarchy(P, A, m);
p^q in Polish-expression-layer(P, A, U) by A1, A2, A4, Th20;
then p^q in Polish-expression-hierarchy(P, A, m+1) by Th31;
hence thesis by Th35, TARSKI:def 3;
end;
theorem Th52:
for P, A, Q st Q is A-closed holds Polish-atoms(P, A) c= Q
proof
let P, A, Q;
assume A0: Q is A-closed;
let a;
assume A1: a in Polish-atoms(P, A);
then reconsider a as FinSequence;
A3: a in P & A.a = 0 by A1, Def9;
{} in Q^^0 by Th4;
then a^{} in Q by A0, A3;
hence thesis by FINSEQ_1:34;
end;
theorem Th53:
for P, A, Q, n st Q is A-closed holds
Polish-expression-hierarchy(P, A, n) c= Q
proof
let P, A, Q, n;
assume A1: Q is A-closed;
defpred X[ Nat ] means
Polish-expression-hierarchy(P, A, $1) c= Q;
A2: X[ 0 ]
proof
Polish-expression-hierarchy(P, A, 0) = Polish-atoms(P, A) by Def10;
hence thesis by A1, Th52;
end;
A3: for k holds X[ k ] implies X[ k+1 ]
proof
let k;
set V = Polish-expression-hierarchy(P, A, k);
assume A4: V c= Q;
for a st a in Polish-expression-hierarchy(P, A, k+1) holds a in Q
proof
let a;
assume a in Polish-expression-hierarchy(P, A, k+1);
then a in Polish-expression-layer(P, A, V) by Th31;
then consider p, q, n such that
A5: a = p^q and
A6: p in P and
A7: n = A.p and
A8: q in V^^n by Def8;
q in Q^^n by A4, A8, TH18, TARSKI:def 3;
hence thesis by A1, A5, A6, A7;
end;
hence thesis by TARSKI:def 3;
end;
for k holds X[ k ] from NAT_1:sch 2(A2, A3);
hence thesis;
end;
theorem TH36:
for P, A holds Polish-atoms(P, A) c= Polish-expression-set(P, A)
proof
let P, A;
Polish-expression-set(P, A) is A-closed by TH51;
hence thesis by Th52;
end;
theorem Th55:
for P, A, Q st Q is A-closed holds Polish-expression-set(P, A) c= Q
proof
let P, A, Q;
assume A1: Q is A-closed;
let a;
assume a in Polish-expression-set(P, A);
then consider n such that A2: a in Polish-expression-hierarchy(P, A, n+1)
by Th37;
thus thesis by A1, A2, Th53, TARSKI:def 3;
end;
theorem
for P, A, r st r in Polish-expression-set(P, A)
ex n, t, q st t in P & n = A.t & r = Polish-operation(P, A, n, t).q
proof
let P, A, r;
assume r in Polish-expression-set(P, A);
then consider m such that A1: r in Polish-expression-hierarchy(P, A, m+1)
by Th37;
set U = Polish-expression-hierarchy(P, A, m);
r in Polish-expression-layer(P, A, U) by A1, Th31;
then consider t, q, n such that
A4: r = t^q and
A5: t in P and
A6: n = A.t and
A7: q in U^^n by Def8;
take n, t, q;
dom Polish-operation(P, A, n, t) = Polish-expression-set(P, A)^^n
by FUNCT_2:def 1;
then U^^n c= dom Polish-operation(P, A, n, t) by Th35, TH18;
hence thesis by A4, A5, A6, A7, Def13;
end;
theorem TH39:
for P, A, n, p, q st p in P & n = A.p & q in Polish-expression-set(P, A)^^n
holds Polish-operation(P, A, n, p).q in Polish-expression-set(P, A)
proof
let P, A, n, p, q;
set U = Polish-expression-set(P, A);
assume A1: p in P & n = A.p & q in U^^n;
A2: U is A-closed by TH51;
dom Polish-operation(P, A, n, p) = U^^n by FUNCT_2:def 1;
then Polish-operation(P, A, n, p).q = p^q by Def13, A1;
hence thesis by A1,A2;
end;
scheme AInd {
P() -> FinSequence-membered set,
A() -> Function of P(), NAT,
X[object] } :
for a st a in Polish-expression-set(P(), A()) holds X[ a ]
provided
A1: for p, q, n
st p in P() & n = A().p & q in Polish-expression-set(P(), A())^^n
holds X[p^q]
proof
set V = Polish-expression-set(P(), A());
consider U being set such that A2: for a holds a in U iff a in V & X[ a ]
from XBOOLE_0:sch 1;
A3: U c= V by A2;
then reconsider U as Subset of P()* by XBOOLE_1:1;
U is A()-closed
proof
let p, n, q;
assume that
A4: p in P() and
A5: n = A().p and
A6: q in U^^n;
A7: U^^n c= V^^n by A3, TH18;
then A8: X[p^q] by A1, A4, A5, A6;
V is A()-closed by TH51;
hence p^q in U by A2, A4, A5, A6, A7, A8;
end;
then Polish-expression-set(P(), A()) c= U by Th55;
hence thesis by A2;
end;
begin
::
:: Polish Notation, Part II: Parsing
::
reserve k,l,m,n,i,j for Nat,
a, b, c, c1, c2 for object,
x, y, z, X, Y, Z for set,
D, D1, D2 for non empty set;
reserve p, q, r, s, t, u, v for FinSequence;
reserve P, Q, R for FinSequence-membered set;
definition
let P;
attr P is antichain-like means
:Def1:
for p,q st p in P & p^q in P holds q = {};
end;
theorem Th1:
for P holds P is antichain-like
iff for p,q st p in P & p^q in P holds p = p^q
proof
let P;
thus P is antichain-like implies for p,q st p in P & p^q in P holds p = p^q
proof
assume that A1: P is antichain-like;
let p, q;
assume p in P & p^q in P;
then q = {} by A1;
hence thesis by FINSEQ_1:34;
end;
thus thesis by FINSEQ_1:87;
end;
theorem TH2:
for P, Q st P c= Q & Q is antichain-like holds P is antichain-like;
registration
cluster trivial -> antichain-like for FinSequence-membered set;
coherence
proof
let P;
assume A1: P is trivial;
let p, q;
assume p in P & p^q in P;
then p = p^q by A1, ZFMISC_1:def 10;
hence thesis by FINSEQ_1:87;
end;
end;
theorem
for P, a st P = {a} holds P is antichain-like;
registration
cluster antichain-like for non empty FinSequence-membered set;
existence
proof
set P = {<*the set*>};
for a st a in P holds a is FinSequence by TARSKI:def 1;
then reconsider P as non empty FinSequence-membered set by FINSEQ_1:def 18;
take P;
thus thesis;
end;
cluster empty -> antichain-like for FinSequence-membered set;
coherence;
end;
definition
mode antichain is antichain-like FinSequence-membered set;
end;
reserve B, C for antichain;
registration
let B;
cluster -> antichain-like FinSequence-membered for Subset of B;
coherence by TH2;
end;
definition
mode Polish-language is non empty antichain;
end;
reserve S, T for Polish-language;
definition
let D be non empty set;
let G be Subset of D*;
redefine attr G is antichain-like means
for g being FinSequence of D,h being FinSequence of D
st g in G & g^h in G holds h = <*>D;
compatibility
proof
thus G is antichain-like implies
for g being FinSequence of D, h being FinSequence of D
st g in G & g^h in G holds h = <*>D;
assume A1: for g being FinSequence of D, h being FinSequence of D
st g in G & g^h in G holds h = <*>D;
for p, q st p in G & p^q in G holds q = {}
proof
let p, q;
assume that A3: p in G and A4: p^q in G;
p^q is FinSequence of D by A4, FINSEQ_1:def 11;
then reconsider p,q as FinSequence of D by FINSEQ_1:36;
p^q in G by A4;
hence thesis by A1, A3;
end;
hence thesis;
end;
end;
theorem TH4:
for B for p, q, r, s st p^q = r^s & p in B & r in B
holds p = r & q = s
proof
let B, p, q, r, s;
assume that A2: p^q = r^s and A3: p in B & r in B;
consider t such that A4: p^t = r or p = r^t by TH1, A2;
thus p = r by A3, A4, Th1;
hence q = s by A2, FINSEQ_1:33;
end;
Th5:
for B, C holds B^C is antichain-like
proof
let B, C, p, q;
assume that A3: p in B^C and A4: p^q in B^C;
consider r,s such that A7: p = r^s and A8: r in B and A9: s in C
by A3, Def2;
consider t,u such that A10: p^q = t^u and A11: t in B and A12: u in C
by A4, Def2;
t^u = r^(s^q) by A7, A10, FINSEQ_1:32;
then u = s^q by A8, A11, TH4;
hence thesis by A9, A12, Def1;
end;
registration
let B, C;
cluster B^C -> antichain-like;
coherence by Th5;
end;
theorem Th6:
for P st for p, q st p in P & q in P holds dom p = dom q
holds P is antichain-like
proof
let P;
assume that A1: for p, q st p in P & q in P holds dom p = dom q;
for p, q st p in P & p^q in P holds p = p^q
proof
let p, q;
assume that A2: p in P & p^q in P;
set r = p^q;
dom p = dom r by A1, A2;
then p = r | (dom r) by FINSEQ_1:21 .= r;
hence thesis;
end;
hence thesis by Th1;
end;
theorem TH7:
for P, a st for p st p in P holds dom p = a holds P is antichain-like
proof
let P, a;
assume that A1: for p st p in P holds dom p = a;
for p, q st p in P & q in P holds dom p = dom q
proof
let p, q;
assume that A2: p in P and A3: q in P;
dom p = a by A1, A2 .= dom q by A1, A3;
hence thesis;
end;
hence thesis by Th6;
end;
theorem TH8:
for B holds {} in B implies B = {{}}
proof
let B;
assume A1: {} in B;
for a st a in B holds a = {}
proof
let a;
assume A3: a in B;
then reconsider a as FinSequence;
{}^a in B by A3, FINSEQ_1:34;
hence thesis by A1, Def1;
end;
then for a holds a in B iff a = {} by A1;
hence thesis by TARSKI:def 1;
end;
registration
let B, n;
cluster B^^n -> antichain-like;
coherence
proof
defpred X[ Nat ] means B^^$1 is antichain-like;
A2: X[ 0 ] by Th7;
A3: for k st X[ k ] holds X[ k + 1 ]
proof
let k;
assume X[ k ];
then (B^^k)^B is antichain-like;
hence thesis by Th7;
end;
for k holds X[ k ] from NAT_1:sch 2(A2,A3);
hence thesis;
end;
end;
registration
let T;
cluster non empty antichain-like for Subset of (T*);
existence
proof
set U = T*;
reconsider T as Subset of U by Th10;
take T;
thus thesis;
end;
let n;
cluster T^^n -> non empty;
coherence;
end;
definition
let T;
mode Polish-language of T is non empty antichain-like Subset of (T*);
mode Polish-arity-function of T -> Function of T, NAT means
:Def5:
ex a st a in T & it.a = 0;
existence
proof
deffunc F(object) = 0;
A1: for a st a in T holds F(a) in NAT
proof
let a; assume a in T;
thus thesis by ORDINAL1:def 12;
end;
consider f being Function of T, NAT such that
A2: for a st a in T holds f.a = F(a) from FUNCT_2:sch 2(A1);
take f;
take a = the Element of T;
thus thesis by A2;
end;
end;
registration
let T;
cluster -> non empty antichain-like FinSequence-membered
for Polish-language of T;
coherence;
end;
reserve A for Polish-arity-function of T;
reserve U, V, W for Polish-language of T;
definition
let T, A;
let t be Element of T;
redefine func A.t -> Nat;
coherence by FUNCT_2:5, ORDINAL1:def 12;
end;
definition
let T, A, U;
redefine func Polish-expression-layer(T, A, U) means
:Def6:
for a holds a in it iff ex t being Element of T, u being Element of T*
st a = t^u & u in U^^(A.t);
compatibility
proof
defpred P[ object ] means ex t being Element of T, u being Element of T*
st $1 = t^u & u in U^^(A.t);
set X = Polish-expression-layer(T, A, U);
let Y be Subset of T*;
A1: for a holds a in X iff P[ a ]
proof
let a;
thus a in X implies P[ a ]
proof
assume a in X;
then consider t, q, n such that
A3: a = t^q and
A4: t in T and
A5: n = A.t and
A6: q in U^^n by Def8;
reconsider t1 = t as Element of T by A4;
U^^n c= T* by Th15;
then reconsider q1 = q as Element of T* by A6;
take t1, q1;
thus thesis by A3, A5, A6;
end;
assume P[ a ];
then consider t being Element of T, u being Element of T* such that
A10: a = t^u and
A11: u in U^^(A.t);
set n = A.t;
T c= T* by Th10;
then t in T*;
then a in T* by A10, Th13;
hence a in X by A10, A11, Def8;
end;
hence X = Y implies (for a holds a in Y iff P[ a ]);
assume A20: for a holds a in Y iff P[ a ];
thus X = Y from XBOOLE_0:sch 2(A1, A20);
end;
end;
definition
let B, p;
attr p is B-headed means
ex q, r st q in B & p = q^r;
end;
definition
let B, P;
attr P is B-headed means
:Def8:
for p st p in P holds p is B-headed;
end;
theorem Th11a:
for B, C, p st p is B-headed & B c= C holds p is C-headed;
theorem
for B, C, P st P is B-headed & B c= C holds P is C-headed by Th11a;
Th13:
for B, P holds B^P is B-headed
proof
let B, P, p;
assume p in B^P;
then consider q, r such that A2: p = q^r & q in B & r in P by Def2;
thus thesis by A2;
end;
registration
let B, P;
cluster B^P -> B-headed;
coherence by Th13;
end;
theorem
for B, C, p st p is (B^C)-headed holds p is B-headed
proof
let B, C, p;
assume p is (B^C)-headed;
then consider q, r such that
A1: q in B^C and
A2: p = q^r;
consider s, t such that
A4: q = s^t and
A5: s in B and
t in C by A1, Def2;
p = s^(t^r) by A2, A4, FINSEQ_1:32;
hence thesis by A5;
end;
theorem Th15:
for B holds B is B-headed
proof
let B;
B = B^{{}} by Th3;
hence B is B-headed;
end;
registration
let B;
cluster B-headed for FinSequence-membered set;
existence
proof
take B;
thus thesis by Th15;
end;
end;
registration
let B;
let P be B-headed FinSequence-membered set;
cluster -> B-headed for Subset of P;
coherence by Def8;
end;
registration
let S;
cluster non empty S-headed for FinSequence-membered set;
existence
proof
take S;
thus thesis by Th15;
end;
end;
theorem Th16:
for S, m, n holds S^^(m+n) is (S^^m)-headed
proof
let S, m, n;
S^^(m+n)=(S^^m)^(S^^n) by Th11;
hence thesis;
end;
definition
let S, p;
func S-head p -> FinSequence means :Def9a:
it in S & ex r st p = it^r if p is S-headed otherwise it = {};
consistency;
existence;
uniqueness by TH4;
end;
definition
let S, p;
func S-tail p -> FinSequence means :Def10:
p = (S-head p)^it;
existence
proof
per cases;
suppose p is S-headed;
hence thesis by Def9a;
end;
suppose not p is S-headed;
then S-head p = {} by Def9a;
then p = (S-head p)^p by FINSEQ_1:34;
hence thesis;
end;
end;
uniqueness by FINSEQ_1:33;
end;
theorem Th17:
for S, s, t st s in S holds S-head (s^t) = s & S-tail (s^t) = t
proof
let S, s, t;
assume A1: s in S;
set u = s^t;
u is S-headed by A1;
hence S-head u = s by A1, Def9a;
hence thesis by Def10;
end;
theorem Th18:
for S, s st s in S holds S-head s = s & S-tail s = {}
proof
let S, s;
assume s in S;
then S-head (s^{}) = s & S-tail (s^{}) = {} by Th17;
hence thesis by FINSEQ_1:34;
end;
theorem Th19:
for S, T, u st u in S^T holds S-head u in S & S-tail u in T
proof
let S, T, u;
assume u in S^T;
then consider s, t such that A2: u = s^t & s in S & t in T by Def2;
thus thesis by A2, Th17;
end;
theorem Th20:
for S, T, u st S c= T & u is S-headed holds
S-head u = T-head u & S-tail u = T-tail u
proof
let S, T, u;
assume that
A1: S c= T and
A2: u is S-headed;
consider q, r such that A3: q in S and A4: u = q^r by A2;
thus S-head u = q by A3, A4, Th17 .= T-head u by A1, A3, A4, Th17;
thus S-tail u = r by A3, A4, Th17 .= T-tail u by A1, A3, A4, Th17;
end;
theorem Th21:
for S, s, t st s is S-headed holds
s^t is S-headed & S-head (s^t) = S-head s & S-tail (s^t) = (S-tail s)^t
proof
let S, s, t;
assume s is S-headed;
then consider q, r such that A1: q in S and A2: s = q^r;
A3: s^t = q^(r^t) by A2, FINSEQ_1:32;
hence s^t is S-headed by A1;
thus S-head (s^t) = q by A1, A3, Th17 .= S-head s by A1, A2, Th17;
thus S-tail (s^t) = r^t by A1, A3, Th17 .= (S-tail s)^t by A1, A2, Th17;
end;
theorem Th22:
for S, m, n, s st m+1 <= n & s in S^^n
holds s is (S^^m)-headed & (S^^m)-tail s is S-headed
proof
let S, m, n, s;
assume that
A1: m+1 <= n and
A2: s in S^^n;
consider l such that A3: m+1+l = n by A1, NAT_1:10;
A4: m+(1+l) = n by A3;
then S^^n is (S^^m)-headed by Th16;
hence s is (S^^m)-headed by A2;
set u = (S^^m)-tail s;
s in (S^^m)^(S^^(1+l)) by A2, A4, Th11;
then u in S^^(1+l) by Th19;
then u in (S^^1)^(S^^l) by Th11;
then A6: u in S^(S^^l) by Th8;
S^(S^^l) is S-headed;
hence thesis by A6;
end;
theorem Th23:
for S, s holds s is (S^^0)-headed & (S^^0)-head s = {} & (S^^0)-tail s = s
proof
let S, s;
A1: s = {}^s by FINSEQ_1:34;
{} in S^^0 by Th4;
hence thesis by A1, Th17;
end;
registration
let T, A;
cluster Polish-atoms(T, A) -> non empty antichain-like;
coherence
proof
set U = Polish-atoms(T, A);
consider a such that A4: a in T & A.a = 0 by Def5;
U is non empty & U c= T by A4, Def9;
hence thesis;
end;
let U;
cluster Polish-expression-layer(T, A, U) -> non empty antichain-like;
coherence
proof
set X = Polish-expression-layer(T, A, U);
the Element of Polish-atoms(T, A) in X by Th26, TARSKI:def 3;
hence X is non empty;
let p, q;
assume that A11: p in X and A12: p^q in X;
consider t1 being Element of T, u1 being Element of T* such that
A13: p = t1^u1 and A14: u1 in U^^(A.t1) by A11, Def6;
consider t2 being Element of T, u2 being Element of T* such that
A15: p^q = t2^u2 and A16: u2 in U^^(A.t2) by A12, Def6;
t1^(u1^q) = t2^u2 by FINSEQ_1:32, A13, A15;
then t1 = t2 & u1^q = u2 by TH4;
hence q = {} by A14, A16, Def1;
end;
end;
definition
let T, A, U;
redefine func Polish-expression-layer(T, A, U) -> Polish-language of T;
coherence;
end;
definition
let T, A;
func Polish-operations(T, A) -> Subset of T equals
{t where t is Element of T : A.t <> 0};
coherence
proof
set P = {t where t is Element of T : A.t <> 0};
P c= T
proof
let a;
assume a in P;
then consider t being Element of T such that A1: a = t and A.t <> 0;
thus thesis by A1;
end;
hence thesis;
end;
end;
registration
let T, A, n;
cluster Polish-expression-hierarchy(T, A, n) -> antichain-like non empty;
coherence
proof
defpred X[ Nat ] means
Polish-expression-hierarchy(T, A, $1) is Polish-language;
Polish-expression-hierarchy(T, A, 0) = Polish-atoms(T, A) by TH22;
then A1: X[ 0 ];
A2: for k holds X[ k ] implies X[ k + 1 ]
proof
let k;
set U = Polish-expression-hierarchy(T, A, k);
assume X[ k ];
then reconsider U as Polish-language of T;
Polish-expression-hierarchy(T, A, k+1) = Polish-expression-layer(T, A, U)
by Th31;
hence thesis;
end;
for k holds X[k] from NAT_1:sch 2(A1, A2);
hence thesis;
end;
end;
definition
let T, A, n;
redefine func Polish-expression-hierarchy(T, A, n) -> Polish-language of T;
coherence;
end;
definition
let T, A;
func Polish-WFF-set(T, A) -> Polish-language of T equals
Polish-expression-set(T, A);
coherence
proof
set Y = Polish-expression-set(T, A);
Polish-expression-hierarchy(T, A, 0) c= Y by Th35;
then reconsider Y as non empty Subset of T*;
Y is antichain-like
proof
let p, q;
assume that A2: p in Y and A3: p^q in Y;
consider m such that A10: p in Polish-expression-hierarchy(T, A, m+1)
by A2, Th37;
consider n such that A11: p^q in Polish-expression-hierarchy(T, A, n+1)
by A3, Th37;
set B = Polish-expression-hierarchy(T, A, (m+1)+(n+1));
A12: Polish-expression-hierarchy(T, A, m+1) c= B by Th34;
A13: Polish-expression-hierarchy(T, A, n+1) c= B by Th34;
B is antichain-like;
hence thesis by A10, A11, A12, A13;
end;
hence thesis;
end;
end;
definition
let T, A;
mode Polish-WFF of T, A is Element of Polish-WFF-set(T, A);
end;
definition
let T, A;
let t be Element of T;
func Polish-operation (T, A, t)
-> Function of (Polish-WFF-set(T, A))^^(A.t), Polish-WFF-set(T, A) equals
Polish-operation(T, A, A.t, t);
coherence
proof
set V = Polish-expression-set(T, A);
set n = A.t;
set f = Polish-operation(T, A, A.t, t);
A1: dom f = V^^n by FUNCT_2:def 1;
for a st a in V^^n holds f.a in V by TH39;
hence thesis by A1, FUNCT_2:3;
end;
end;
definition
let T, A;
let t be Element of T;
assume A1: A.t = 1;
func Polish-unOp (T, A, t) -> UnOp of Polish-WFF-set(T, A) equals
:Def21:
Polish-operation(T, A, t);
coherence
proof
set U = Polish-WFF-set(T, A);
U^^1 = U by Th8;
hence thesis by A1;
end;
end;
definition
let T, A;
let t be Element of T;
assume A1: A.t = 2;
func Polish-binOp (T, A, t) -> BinOp of Polish-WFF-set(T, A) means
:Def22:
for u, v st u in Polish-WFF-set(T, A)
& v in Polish-WFF-set(T, A) holds
it.(u, v) = Polish-operation(T, A, t).(u^v);
existence
proof
set W = Polish-WFF-set(T, A);
defpred X[object, object, object] means
ex u, v st $1 = u & $2 = v & $3 = Polish-operation(T, A, t).(u^v);
A2: for a, b st a in W & b in W ex c st c in W & X[a, b, c]
proof
let a, b;
assume that
A3: a in W and
A4: b in W;
reconsider u = a as FinSequence by A3;
reconsider v = b as FinSequence by A4;
take c = Polish-operation(T, A, t).(u^v);
W^^2 = W^^(1+1)
.= (W^^1)^W by Th7
.= W^W by Th8;
then u^v in W^^2 by A3, A4, Def2;
hence c in W by A1, FUNCT_2:5;
thus thesis;
end;
consider f being Function of [: W, W :], W such that
A11: for a, b st a in W & b in W holds X[a, b, f.(a,b)]
from BINOP_1:sch 1(A2);
take f;
let u, v;
assume that
A12: u in W and
A13: v in W;
X[u, v, f.(u, v)] by A11, A12, A13;
hence f.(u, v) = Polish-operation(T, A, t).(u^v);
end;
uniqueness
proof
set W = Polish-WFF-set(T, A);
let f, g be Function of [: W, W :], W;
assume that
A10: for u, v st u in W & v in W holds
f.(u, v) = Polish-operation(T, A, t).(u^v) and
A11: for u, v st u in W & v in W holds
g.(u, v) = Polish-operation(T, A, t).(u^v);
A12: dom f = [: W, W :] by FUNCT_2:def 1;
A13: dom g = [: W, W :] by FUNCT_2:def 1;
for a, b st a in W & b in W holds f.(a, b) = g.(a, b)
proof
let a, b;
assume that
A20: a in W and
A21: b in W;
reconsider u = a as FinSequence by A20;
reconsider v = b as FinSequence by A21;
thus f.(a, b) = Polish-operation(T, A, t).(u^v) by A10, A20, A21
.= g.(a, b) by A11, A20, A21;
end;
hence thesis by A12, A13, FUNCT_3:6;
end;
end;
reserve F, G for Polish-WFF of T, A;
definition
let X, Y;
let F be PartFunc of X, bool Y;
attr F is exhaustive means
for a st a in Y ex b st b in dom F & a in F.b;
end;
registration
let X be non empty set;
cluster non exhaustive disjoint_valued for FinSequence of bool X;
existence
proof
set p = <*> bool X;
take p;
thus p is non exhaustive
proof
assume A2: p is exhaustive;
X is non empty;
then consider a such that A3: a in X;
consider b such that A4: b in dom p & a in p.b by A2, A3;
thus thesis by A4;
end;
thus p is disjoint_valued;
end;
end;
theorem TH37:
for X, Y for F being PartFunc of X, bool Y holds
F is non exhaustive iff
ex a st a in Y & for b st b in dom F holds not a in F.b;
definition
let T;
let B be non exhaustive disjoint_valued FinSequence of bool T;
func Polish-arity-from-list B -> Polish-arity-function of T equals
arity-from-list B;
coherence
proof
set f = arity-from-list B;
consider a such that A1: a in T and
A2: for b st b in dom B holds not a in B.b by TH37;
not ex n st a in B.n
proof
given n such that A3: a in B.n;
n in dom B by A3, FUNCT_1:def 2;
hence thesis by A2, A3;
end;
then f.a = 0 by TH30, A1;
hence thesis by A1, Def5;
end;
end;
registration
cluster with_non-empty_elements
for antichain-like FinSequence-membered set;
existence
proof
set X = { <*the set*> };
for a st a in X holds a is FinSequence by TARSKI:def 1;
then reconsider X as non empty antichain-like FinSequence-membered set
by FINSEQ_1:def 18;
take X;
thus thesis;
end;
cluster non trivial for Polish-language;
existence
proof
set T = { <*0*>, <*1*> };
for a st a in T holds a is FinSequence by TARSKI:def 2;
then reconsider T as non empty FinSequence-membered set by FINSEQ_1:def 18;
for p st p in T holds dom p = Seg 1
proof
let p;
assume p in T;
then p = <*0*> or p = <*1*> by TARSKI:def 2;
hence thesis by FINSEQ_1:def 8;
end;
then reconsider T as Polish-language by TH7;
take T;
T is non trivial
proof
assume A3: T is trivial;
<*0*> in T & <*1*> in T by TARSKI:def 2;
then <*0*> = <*1*> by ZFMISC_1:def 10, A3;
then 0 = <*1*>.1 by FINSEQ_1:def 8 .= 1 by FINSEQ_1:def 8;
hence thesis;
end;
hence thesis;
end;
end;
registration
cluster non trivial -> with_non-empty_elements
for antichain-like FinSequence-membered set;
coherence by TH8, SETFAM_1:def 8;
end;
definition
let S, n, m;
let p be Element of S^^(n+1+m);
func decomp( S, n, m, p ) -> Element of S equals
S-head((S^^n)-tail p);
coherence
proof
set q = (S^^n)-tail p;
S^^(n+1+m) = (S^^(n+1))^(S^^m) by Th11
.= (S^^n)^(S^^1)^(S^^m) by Th11
.= (S^^n)^((S^^1)^(S^^m)) by Th2
.= (S^^n)^(S^(S^^m)) by Th8;
then q in S^(S^^m) by Th19;
hence thesis by Th19;
end;
end;
definition
let S, n;
let p be Element of S^^n;
func decomp( S, n, p ) -> FinSequence of S means
:Def32:
dom it = Seg n
& for m st m in Seg n ex k st m = k+1 & it.m = S-head((S^^k)-tail p);
existence
proof
defpred X[ object, object ] means
ex k st $1 = k+1 & $2 = S-head((S^^k)-tail p);
A1: for i st i in Seg n ex s being Element of S st X[ i, s ]
proof
let i;
assume i in Seg n;
then A3: 1 <= i & i <= n by FINSEQ_1:1;
then consider j such that A4: i = j+1 by NAT_1:6;
consider l such that A5: i + l = n by A3, NAT_1:10;
reconsider p as Element of S^^(j+1+l) by A4, A5;
take decomp( S, j, l, p );
thus thesis by A4;
end;
consider q being FinSequence of S such that
A10: dom q = Seg n and
A11: for i st i in Seg n holds X[ i, q.i ] from FINSEQ_1:sch 5(A1);
take q;
thus thesis by A10, A11;
end;
uniqueness
proof
let t, u be FinSequence of S;
assume that
A1: dom t = Seg n and
A2: for m st m in Seg n
ex k st m = k+1 & t.m = S-head((S^^k)-tail p) and
A3: dom u = Seg n and
A4: for m st m in Seg n
ex k st m = k+1 & u.m = S-head((S^^k)-tail p);
for i st i in dom t holds t.i = u.i
proof
let i;
assume A5: i in dom t;
then consider k such that
A7: i = k+1 and
A8: t.i = S-head((S^^k)-tail p) by A1, A2;
consider l such that
A9: i = l+1 and
A10: u.i = S-head((S^^l)-tail p) by A1, A4, A5;
thus thesis by A7, A8, A9, A10;
end;
hence thesis by A1, A3, FINSEQ_1:13;
end;
end;
theorem Th50:
for S, T, n for s being Element of S^^n, t being Element of T^^n
st S c= T & s = t holds decomp( S, n, s ) = decomp( T, n, t )
proof
let S, T, n;
let s be Element of S^^n;
let t be Element of T^^n;
assume that A1: S c= T and A2: s = t;
set p = decomp( S, n, s );
set q = decomp( T, n, t );
A4: dom p = Seg n & dom q = Seg n by Def32;
for a st a in Seg n holds p.a = q.a
proof
let a;
assume A6: a in Seg n;
then reconsider a as Nat;
consider k such that A7: a = k+1 and A8: p.a = S-head((S^^k)-tail s)
by A6, Def32;
consider l such that A9: a = l+1 and A10: q.a = T-head((T^^l)-tail t)
by A6, Def32;
A11: S^^l c= T^^l by A1, TH18;
l+1 <= n by A6, A9, FINSEQ_1:1;
then A12: s is (S^^l)-headed & (S^^l)-tail s is S-headed by Th22;
then A14: (T^^l)-tail t is S-headed by A2, A11, Th20;
(S^^k)-tail s = (T^^l)-tail t by A2, A7, A9, A11, A12, Th20;
hence thesis by A1, A8, A10, A14, Th20;
end;
hence thesis by A4, FUNCT_1:def 11;
end;
theorem Th51:
for S for q being Element of S^^0 holds decomp(S, 0, q) = {}
proof
let S;
let q be Element of S^^0;
dom decomp(S, 0, q) = Seg 0 by Def32;
hence thesis;
end;
theorem Th54:
for S, n for q being Element of S^^n holds len decomp(S, n, q) = n
proof
let S, n;
reconsider n1 = n as Element of NAT by ORDINAL1:def 12;
let q be Element of S^^n;
set p = decomp(S, n, q);
dom p = Seg n by Def32;
then len p = n1 by FINSEQ_1:def 3;
hence thesis;
end;
theorem TH55:
for S for q being Element of S^^1 holds decomp(S, 1, q) = <*q*>
proof
let S;
let q be Element of S^^1;
set w = decomp(S, 1, q);
1 in Seg 1 by FINSEQ_1:2, TARSKI:def 1;
then consider k such that
A2: 1 = k+1 and
A3: w.1 = S-head((S^^k)-tail q) by Def32;
q in S^^1;
then A4: q in S by Th8;
w.1 = S-head q by A2, A3, Th23
.= q by Th18, A4;
hence thesis by Th54, FINSEQ_1:40;
end;
theorem Th56:
for S for p, q being Element of S for r being Element of S^^2 st r = p^q
holds decomp(S, 2, r) = <*p, q*>
proof
let S;
let p, q be Element of S;
let r be Element of S^^2;
assume A1: r = p^q;
set w = decomp(S, 2, r);
1 in Seg 2 by FINSEQ_1:2, TARSKI:def 2;
then consider k such that
A2: 1 = k+1 and
A3: w.1 = S-head((S^^k)-tail r) by Def32;
A5: w.1 = S-head r by A2, A3, Th23
.= p by A1, Th17;
2 in Seg 2 by FINSEQ_1:2, TARSKI:def 2;
then consider m such that
A7: 2 = m+1 and
A8: w.2 = S-head((S^^m)-tail r) by Def32;
S^^m = S by A7,Th8;
then A9: (S^^m)-tail r = q by A1, Th17;
w.2 = q by A8, A9, Th18;
hence thesis by A5, Th54, FINSEQ_1:44;
end;
theorem Th60:
for T, A holds Polish-WFF-set(T, A) is T-headed
proof
let T, A, p;
assume p in Polish-WFF-set(T, A);
then consider n such that A3: p in Polish-expression-hierarchy(T, A, n+1)
by Th37;
set U = Polish-expression-hierarchy(T, A, n);
p in Polish-expression-layer(T, A, U) by A3, Th31;
hence thesis by TH21;
end;
theorem Th61:
for T, A, n holds Polish-expression-hierarchy(T, A, n) is T-headed
proof
let T, A, n;
reconsider U = Polish-expression-hierarchy(T, A, n)
as Subset of Polish-WFF-set(T, A) by Th35;
Polish-WFF-set(T, A) is T-headed by Th60;
then U is T-headed;
hence thesis;
end;
definition
let T, A, F;
func Polish-WFF-head F -> Element of T equals
T-head F;
coherence
proof
Polish-WFF-set(T, A) is T-headed by Th60;
then F is T-headed;
hence thesis by Def9a;
end;
end;
definition
let T, A, n;
let F be Element of Polish-expression-hierarchy(T, A, n);
func Polish-WFF-head F -> Element of T equals
T-head F;
coherence
proof
Polish-expression-hierarchy(T, A, n) is T-headed by Th61;
then F is T-headed;
hence thesis by Def9a;
end;
end;
definition
let T, A, F;
func Polish-arity F -> Nat equals
A.(Polish-WFF-head F);
coherence;
end;
definition
let T, A, n;
let F be Element of Polish-expression-hierarchy(T, A, n);
func Polish-arity F -> Nat equals
A.(Polish-WFF-head F);
coherence;
end;
theorem Th62:
for T, A, F holds T-tail F in (Polish-WFF-set(T, A))^^Polish-arity F
proof
let T, A, F;
consider n, t, u such that
A1: t in T and
A2: n = A.t and
A3: u in Polish-WFF-set(T, A)^^n and
A4: F = t^u by TH32;
T-head F = t & T-tail F = u by A1, A4, Th17;
hence thesis by A2, A3;
end;
theorem Th63:
for T, A, n for F being Element of Polish-expression-hierarchy(T, A, n+1)
holds T-tail F in Polish-expression-hierarchy(T, A, n)^^Polish-arity F
proof
let T, A, n;
let F be Element of Polish-expression-hierarchy(T, A, n+1);
set U = Polish-expression-hierarchy(T, A, n);
F in Polish-expression-hierarchy(T, A, n+1);
then F in Polish-expression-layer(T, A, U) by Th31;
then consider t being Element of T, u being Element of T* such that
A2: F = t^u and
A3: u in U^^(A.t) by Def6;
T-head F = t & T-tail F = u by A2, Th17;
hence thesis by A3;
end;
definition
let T, A, F;
func (T, A)-tail F -> Element of Polish-WFF-set(T, A)^^Polish-arity F equals
T-tail F;
coherence by Th62;
end;
theorem
for T, A, F st T-head F in Polish-atoms(T, A) holds F = T-head F
proof
let T, A, F;
assume T-head F in Polish-atoms(T, A);
then Polish-arity F = 0 by Def9;
then T-tail F in Polish-WFF-set(T, A)^^0 by Th62;
then T-tail F in {{}} by Th7;
then T-tail F = {} by TARSKI:def 1;
then F = (T-head F)^{} by Def10;
hence thesis by FINSEQ_1:34;
end;
definition
let T, A, n;
let F be Element of Polish-expression-hierarchy(T, A, n+1);
func (T, A)-tail F
-> Element of Polish-expression-hierarchy(T, A, n)^^Polish-arity F equals
T-tail F;
coherence by Th63;
end;
definition
let T, A, F;
func Polish-WFF-args F -> FinSequence of Polish-WFF-set(T, A) equals
decomp( Polish-WFF-set(T, A), Polish-arity F, (T, A)-tail F );
coherence;
end;
definition
let T, A, n;
let F be Element of Polish-expression-hierarchy(T, A, n+1);
func Polish-WFF-args F
-> FinSequence of Polish-expression-hierarchy(T, A, n) equals
decomp( Polish-expression-hierarchy(T, A, n), Polish-arity F, (T,A)-tail F );
coherence;
end;
theorem Th65:
for T, A for t being Element of T for u st u in Polish-WFF-set(T, A)^^(A.t)
holds T-tail (Polish-operation(T, A, t).u) = u
proof
let T, A;
let t be Element of T;
let u;
set W = Polish-WFF-set(T, A);
set f = Polish-operation(T, A, t);
assume u in W^^(A.t);
then u in dom f by FUNCT_2:def 1;
then f.u = t^u by Def13;
hence thesis by Th17;
end;
theorem Th67:
for T, A, F, n st F in Polish-expression-hierarchy(T, A, n+1) holds
rng Polish-WFF-args F c= Polish-expression-hierarchy(T, A, n)
proof
let T, A, F, n;
assume F in Polish-expression-hierarchy(T, A, n+1);
then reconsider G = F as Element of Polish-expression-hierarchy(T, A, n+1);
rng Polish-WFF-args F = rng Polish-WFF-args G by Th50, Th35;
hence thesis by FINSEQ_1:def 4;
end;
theorem Th68:
for Y, Z, D for p being FinSequence for f being Function of Y, D
for g being Function of Z, D
st rng p c= Y & rng p c= Z & for a st a in rng p holds f.a = g.a
holds f * p = g * p
proof
let Y, Z, D;
let p be FinSequence;
let f be Function of Y, D;
let g be Function of Z, D;
assume that
A1: rng p c= Y and
A2: rng p c= Z and
A3: for a st a in rng p holds f.a = g.a;
reconsider p1 = p as FinSequence of Y by A1, FINSEQ_1:def 4;
reconsider q = f * p1 as FinSequence by FINSEQ_2:32;
reconsider p2 = p as FinSequence of Z by A2, FINSEQ_1:def 4;
reconsider r = g * p2 as FinSequence by FINSEQ_2:32;
q = r
proof
thus len q = len p by FINSEQ_2:33
.= len r by FINSEQ_2:33;
let k;
assume that
A6: 1 <= k and
A7: k <= len q;
k <= len p by A7, FINSEQ_2:33;
then k in Seg len p by A6, FINSEQ_1:1;
then A8: k in dom p by FINSEQ_1:def 3;
hence q.k = f.(p.k) by FUNCT_1:13
.= g.(p.k) by A3, A8, FUNCT_1:3
.= r.k by FUNCT_1:13, A8;
end;
hence thesis;
end;
definition
let T, A, D;
func Polish-recursion-domain(A, D) -> Subset of [: T, D* :] equals
{[t,p] where t is Element of T, p is FinSequence of D : len p = A.t};
coherence
proof
set X={[t,p] where t is Element of T, p is FinSequence of D: len p = A.t};
X c= [: T, D* :]
proof
let a;
assume a in X;
then consider t being Element of T, p being FinSequence of D such that
A1: a = [t, p] and len p = A.t;
p in D* by FINSEQ_1:def 11;
hence a in [: T, D* :] by A1, ZFMISC_1:def 2;
end;
hence thesis;
end;
end;
definition
let T, A, D;
mode Polish-recursion-function of A, D
is Function of Polish-recursion-domain(A, D), D;
end;
reserve f for Polish-recursion-function of A, D;
reserve K, K1, K2 for Function of Polish-WFF-set(T, A), D;
definition
let T, A, D, f, K;
attr K is f-recursive means
for F holds K.F = f.[ T-head F, K * (Polish-WFF-args F) ];
end;
Lm71:
for T, A, D, f, K1, K2, F
st K1 is f-recursive & K2 is f-recursive & F in Polish-atoms(T, A) holds
K1.F = K2.F
proof
let T, A, D, f, K1, K2, F;
assume that
A1: K1 is f-recursive and
A2: K2 is f-recursive and
A3: F in Polish-atoms(T, A);
F in T by A3, Def9;
then A5: Polish-WFF-head F = F by Th18;
then Polish-arity F = 0 by A3, Def9;
then Polish-WFF-args F = {} by Th51;
then K1.F = f.[ F, K1 * {} ] & K2.F = f.[ F, K2 * {} ] by A1, A2, A5;
hence thesis;
end;
theorem Th72:
for T, A, D, f, K1, K2 st K1 is f-recursive & K2 is f-recursive holds K1 = K2
proof
let T, A, D, f, K1, K2;
assume that
A1: K1 is f-recursive and
A2: K2 is f-recursive;
set W = Polish-WFF-set(T, A);
set X = { F where F is Polish-WFF of T, A : K1.F = K2.F };
for a st a in X holds a in W
proof
let a;
assume a in X;
then consider F being Polish-WFF of T, A
such that A3: a = F and K1.F = K2.F;
thus thesis by A3;
end;
then A4: X c= W;
then reconsider X as antichain-like Subset of T* by XBOOLE_1:1;
ex p st p in X
proof
Polish-atoms(T, A) is non empty;
then consider a such that B1: a in Polish-atoms(T, A);
reconsider a as Polish-WFF of T, A by B1, TH36, TARSKI:def 3;
take a;
K1.a = K2.a by Lm71, A1, A2, B1;
hence a in X;
end;
then reconsider X as Polish-language of T;
A15: for a st a in X holds K1.a = K2.a
proof
let a;
assume a in X;
then consider F being Polish-WFF of T, A
such that A16: a = F and A17: K1.F = K2.F;
thus thesis by A16, A17;
end;
for p, n, q st p in T & n = A.p & q in X^^n holds p^q in X
proof
let p, n, q;
assume that
A5: p in T and
A6: n = A.p and
A7: q in X^^n;
A8: X^^n c= W^^n by A4, TH18;
reconsider q as Element of X^^n by A7;
reconsider w = q as Element of W^^n by A8;
W is A-closed by TH51;
then reconsider r = p^w as Polish-WFF of T, A by A5, A6;
set u = Polish-WFF-args r;
T-head r = p & T-tail r = w by A5, Th17;
then u = decomp( X, n, q ) by A4, A6, Th50;
then A23: rng u c= X by FINSEQ_1:def 4;
then A24: rng u c= W by A4;
for a st a in rng u holds K1.a = K2.a by A23, A15;
then K1 * u = K2 * u by A24, Th68;
then K1.r = f.[ T-head r, K2 * u ] by A1 .= K2.r by A2;
hence thesis;
end;
then X is A-closed;
then W c= X by Th55;
then A30: for a st a in W holds K1.a = K2.a by A15;
dom K1 = W & dom K2 = W by FUNCT_2:def 1;
hence thesis by A30, FUNCT_1:2;
end;
reserve L for non trivial Polish-language;
reserve E for Polish-arity-function of L;
reserve g for Polish-recursion-function of E, D;
reserve J, J1, J2, J3 for Subset of Polish-WFF-set(L, E);
reserve H for Function of J, D;
reserve H1 for Function of J1, D;
reserve H2 for Function of J2, D;
reserve H3 for Function of J3, D;
definition
let L, E, D, g, J, H;
attr H is g-recursive means
for F being Polish-WFF of L, E st F in J & rng Polish-WFF-args F c= J holds
H.F = g.[ L-head F, H * (Polish-WFF-args F) ];
end;
Lm72:
for L, E, D, g ex J, H st J = Polish-expression-hierarchy(L, E, 0)
& H is g-recursive
proof
let L, E, D, g;
deffunc G( object ) = g.[ $1, {} ];
set J = Polish-expression-hierarchy(L, E, 0);
reconsider J as Subset of Polish-WFF-set(L, E) by Th35;
A1: for a st a in J holds G(a) in D
proof
let a;
assume a in J;
then A6: a in Polish-atoms(L, E) by TH22;
then reconsider t = a as Element of L by Def9;
set p = <*>D;
set b = [t, p];
len p = E.t by A6, Def9;
then b in Polish-recursion-domain(E, D);
hence thesis by FUNCT_2:5;
end;
consider H being Function of J, D such that
A9: for a st a in J holds H.a = G( a )
from FUNCT_2:sch 2(A1);
take J, H;
thus J = Polish-expression-hierarchy(L, E, 0);
let F be Polish-WFF of L, E;
assume that
A10: F in J and
rng Polish-WFF-args F c= J;
A12: F in Polish-atoms(L, E) by A10, TH22;
then F in L by Def9;
then A14: Polish-WFF-head F = F by Th18;
then Polish-arity F = 0 by A12, Def9;
then A15: Polish-WFF-args F = {} by Th51;
thus H.F = g.[ L-head F, {} ] by A9, A10, A14
.= g.[ L-head F, H * (Polish-WFF-args F) ] by A15;
end;
Lm73:
for L, E, D, g, n, J, H, J1, H1
st J = Polish-expression-hierarchy(L, E, n)
& J1 = Polish-expression-hierarchy(L, E, n+1)
& H is g-recursive
& for F being Polish-WFF of L, E st F in J1
holds H1.F = g.[ L-head F, H * (Polish-WFF-args F) ]
holds H1 is g-recursive
proof
let L, E, D, g, n, J, H, J1, H1;
assume that
A1: J = Polish-expression-hierarchy(L, E, n) and
A2: J1 = Polish-expression-hierarchy(L, E, n+1) and
A3: H is g-recursive and
A4: for F being Polish-WFF of L, E st F in J1
holds H1.F = g.[ L-head F, H * (Polish-WFF-args F) ];
A5: J c= J1 by A1, A2, Th34;
A6: for a st a in J holds H1.a = H.a
proof
let a;
assume A10: a in J;
reconsider G1 = a as Polish-WFF of L, E by A10;
reconsider F = a as Element of J by A10;
A12: rng Polish-WFF-args G1 c= J by A1, A2, A5, A10, Th67;
thus H1.a = g.[ L-head F, H * (Polish-WFF-args G1) ] by A4, A5, A10
.= H.a by A3, A10, A12;
end;
let F be Polish-WFF of L, E;
assume that
A20: F in J1 and
A21: rng Polish-WFF-args F c= J1;
A23: rng Polish-WFF-args F c= J by A1, A2, A20, Th67;
then A24: for a st a in rng Polish-WFF-args F holds H.a = H1.a by A6;
A27: H * Polish-WFF-args F = H1 * Polish-WFF-args F by A21, A23, A24, Th68;
thus H1.F = g.[ L-head F, H1 * (Polish-WFF-args F) ] by A4, A20, A27;
end;
Lm74:
for L, E, D, g, n, J, H, J1, H1, a
st J = Polish-expression-hierarchy(L, E, n) & H is g-recursive
& J c= J1 & H1 is g-recursive & a in J
holds H.a = H1.a
proof
let L, E, D, g, n, J, H, J1, H1, a;
assume that
A1: J = Polish-expression-hierarchy(L, E, n) and
A2: H is g-recursive and
A3: J c= J1 and
A4: H1 is g-recursive and
A5: a in J;
defpred X[ Nat ] means
for a st a in J & a in Polish-expression-hierarchy(L, E, $1)
holds H.a = H1.a;
A10: X[ 0 ]
proof
let a;
assume A11: a in J;
then reconsider G = a as Polish-WFF of L, E;
assume a in Polish-expression-hierarchy(L, E, 0);
then A13: a in Polish-atoms(L, E) by TH22;
then a in L by Def9;
then Polish-WFF-head G = G by Th18;
then Polish-arity G = 0 by A13, Def9;
then A15: Polish-WFF-args G = {} by Th51;
then A16: rng Polish-WFF-args G c= J;
A17: rng Polish-WFF-args G c= J1 by A15;
thus H.a = g.[ L-head G, H * {} ] by A2, A11, A15, A16
.= g.[ L-head G, H1 * {} ]
.= H1.a by A3, A4, A11, A15, A17;
end;
A20: for k st X[ k ] holds X[ k+1 ]
proof
let k;
assume A21: X[ k ];
set J2 = Polish-expression-hierarchy(L, E, k);
set J3 = Polish-expression-hierarchy(L, E, k+1);
let a;
assume A22: a in J;
assume A23: a in J3;
per cases;
suppose n <= k;
then consider m such that A24: k = n+m by NAT_1:10;
J c= J2 by A1, A24, Th34;
then reconsider G = a as Element of J2 by A22;
thus H.a = H1.G by A21, A22 .= H1.a;
end;
suppose k < n;
then k+1 <= n by NAT_1:13;
then consider m such that A30: n = k+1+m by NAT_1:10;
A31: J3 c= J by A1, A30, Th34;
reconsider F1 = a as Polish-WFF of L, E by A22;
A32: rng Polish-WFF-args F1 c= J2 by A23, Th67;
J2 c= J3 by Th34;
then A33: rng Polish-WFF-args F1 c= J by A31, A32;
then A34: rng Polish-WFF-args F1 c= J1 by A3;
for b st b in rng Polish-WFF-args F1 holds H.b = H1.b by A21, A32, A33;
then A37: H * Polish-WFF-args F1 = H1 * Polish-WFF-args F1
by A33, A34, Th68;
thus H.a = g.[ L-head F1, H * (Polish-WFF-args F1) ] by A2, A22, A33
.= H1.a by A3, A4, A22, A34, A37;
end;
end;
for k holds X[ k ] from NAT_1:sch 2(A10, A20);
hence H.a = H1.a by A1, A5;
end;
Lm75:
for L, E, D, g, n, J, H
st J = Polish-expression-hierarchy(L, E, n) & H is g-recursive
ex J1, H1
st J1 = Polish-expression-hierarchy(L, E, n+1) & H1 is g-recursive
proof
let L, E, D, g, n, J, H;
assume that
A1: J = Polish-expression-hierarchy(L, E, n) and
A2: H is g-recursive;
set J1 = Polish-expression-hierarchy(L, E, n+1);
reconsider J1 as Subset of Polish-WFF-set(L, E) by Th35;
defpred X[ object, object ] means
ex F being Polish-WFF of L, E
st F = $1 & $2 = g.[ L-head F, H * (Polish-WFF-args F) ];
A4: for a st a in J1 ex b st b in D & X[ a, b ]
proof
let a;
assume A5: a in J1;
then reconsider F = a as Polish-WFF of L, E;
set t = Polish-WFF-head F;
set q = Polish-WFF-args F;
rng q c= J by A1, A5, Th67;
then reconsider q as FinSequence of J by FINSEQ_1:def 4;
reconsider p = H * q as FinSequence of D by FINSEQ_2:32;
set c = [t, p];
take b = g.c;
len p = len q by FINSEQ_2:33 .= E.t by Th54;
then c in Polish-recursion-domain(E, D);
hence b in D by FUNCT_2:5;
thus thesis;
end;
consider H1 being Function of J1, D such that
A21: for a st a in J1 holds X[ a, H1.a ]
from FUNCT_2:sch 1(A4);
take J1, H1;
thus J1 = Polish-expression-hierarchy(L, E, n+1);
for F being Polish-WFF of L, E st F in J1
holds H1.F = g.[ L-head F, H * (Polish-WFF-args F) ]
proof
let F be Polish-WFF of L, E;
assume F in J1;
then consider G being Polish-WFF of L, E such that
A41: G = F and
A42: H1.F = g.[ L-head G, H * (Polish-WFF-args G) ] by A21;
thus thesis by A41, A42;
end;
hence H1 is g-recursive by A1, A2, Lm73;
end;
theorem Th75:
for L, E, D, g, n ex J, H st J = Polish-expression-hierarchy(L, E, n)
& H is g-recursive
proof
let L, E, D, g;
defpred X[ Nat ] means ex J, H st J = Polish-expression-hierarchy(L, E, $1)
& H is g-recursive;
A1: X[ 0 ] by Lm72;
A2: for n st X[ n ] holds X[ n+1 ] by Lm75;
thus for n holds X[ n ] from NAT_1:sch 2(A1, A2);
end;
Lm79:
for L, E, D, g, n, J, H, m, J1, H1, a
st J = Polish-expression-hierarchy(L, E, n) & H is g-recursive
& J1 = Polish-expression-hierarchy(L, E, n+m) & H1 is g-recursive
& a in J
holds H.a = H1.a by Th34, Lm74;
Lm80:
for L, E, D, g, n, J, H, m, J1, H1, a
st J = Polish-expression-hierarchy(L, E, n) & H is g-recursive
& J1 = Polish-expression-hierarchy(L, E, m) & H1 is g-recursive
& a in J & a in J1 holds H.a = H1.a
proof
let L, E, D, g, n, J, H, m, J1, H1, a;
assume that
A1: J = Polish-expression-hierarchy(L, E, n) and
A2: H is g-recursive and
A3: J1 = Polish-expression-hierarchy(L, E, m) and
A4: H1 is g-recursive and
A5: a in J and
A6: a in J1;
consider J2, H2 such that
A10: J2 = Polish-expression-hierarchy(L, E, n+m) and
A11: H2 is g-recursive by Th75;
thus H.a = H2.a by A1, A2, A5, A10, A11, Lm79
.= H1.a by A3, A4, A6, A10, A11, Lm79;
end;
Lm82:
for L, E, D, g, J, H st for a st a in J ex n, J1, H1
st J1 = Polish-expression-hierarchy(L, E, n) & H1 is g-recursive
& a in J1 & H.a = H1.a holds
H is g-recursive
proof
let L, E, D, g, J, H;
assume A1: for a st a in J ex n, J1, H1
st J1 = Polish-expression-hierarchy(L, E, n) & H1 is g-recursive
& a in J1 & H.a = H1.a;
let F be Polish-WFF of L, E;
assume that
A10: F in J and
A11: rng Polish-WFF-args F c= J;
consider n, J1, H1 such that
A12: J1 = Polish-expression-hierarchy(L, E, n) and
A13: H1 is g-recursive and
A14: F in J1 and
A15: H.F = H1.F by A1, A10;
set J2 = Polish-expression-hierarchy(L, E, n+1);
set X = rng Polish-WFF-args F;
J1 c= J2 by A12, Th34;
then A22: X c= J1 by A12, A14, Th67;
A30: for b st b in X holds H1.b = H.b
proof
let b;
assume A31: b in X;
then consider m, J2, H2 such that
A32: J2 = Polish-expression-hierarchy(L, E, m) & H2 is g-recursive and
A34: b in J2 & H.b = H2.b by A1, A11;
thus H.b = H1.b by A12, A13, A22, A31, A32, A34, Lm80;
end;
thus H.F = g.[ L-head F, H1 * (Polish-WFF-args F) ] by A13, A14, A15, A22
.= g.[ L-head F, H * (Polish-WFF-args F) ] by A11, A22, A30, Th68;
end;
theorem Th77:
for L, E, D, g ex K being Function of Polish-WFF-set(L, E), D
st K is g-recursive
proof
let L, E, D, g;
set W = Polish-WFF-set(L, E);
defpred X[ object, object ] means
ex n, J1, H1 st J1 = Polish-expression-hierarchy(L, E, n)
& H1 is g-recursive & $1 in J1 & $2 = H1.$1;
A1: for a st a in W ex b st b in D & X[a, b]
proof
let a;
assume a in W;
then consider n such that
A2: a in Polish-expression-hierarchy(L, E, n+1) by Th37;
consider J1, H1 such that
A3: J1 = Polish-expression-hierarchy(L, E, n+1) and
A4: H1 is g-recursive by Th75;
take b = H1.a;
thus b in D by A2, A3, FUNCT_2:5;
thus thesis by A2, A3, A4;
end;
consider K being Function of W, D such that
A10: for a st a in W holds X[a, K.a] from FUNCT_2:sch 1(A1);
take K;
W c= W;
then reconsider J = W as Subset of W;
reconsider H = K as Function of J, D;
A12: H is g-recursive by A10, Lm82;
let F be Polish-WFF of L, E;
rng Polish-WFF-args F c= J by FINSEQ_1:def 4;
hence K.F = g.[ L-head F, K * (Polish-WFF-args F) ] by A12;
end;
theorem
for L, E for t being Element of L holds Polish-operation(L, E, t)
is one-to-one
proof
let L, E;
let t be Element of L;
set f = Polish-operation(L, E, t);
for a, b st a in dom f & b in dom f & f.a = f.b holds a = b
proof
let a, b;
assume that
A1: a in dom f and
A2: b in dom f and
A3: f.a = f.b;
A4: dom f = Polish-WFF-set(L, E)^^(E.t) by FUNCT_2:def 1;
reconsider a1 = a as FinSequence by A1, A4;
reconsider b1 = b as FinSequence by A2, A4;
t^a1 = f.a1 by A1, Def13
.= t^b1 by A2, A3, Def13;
hence a = b by FINSEQ_1:33;
end;
hence thesis by FUNCT_1:def 4;
end;
theorem
for L, E for t, u being Element of L
st rng Polish-operation(L, E, t) meets rng Polish-operation(L, E, u)
holds t = u
proof
let L, E;
let t, u be Element of L;
set f = Polish-operation(L, E, t);
set g = Polish-operation(L, E, u);
assume rng f meets rng g;
then rng f /\ rng g is non empty;
then consider a such that A2: a in rng f /\ rng g;
A3: a in rng f & a in rng g by A2, XBOOLE_0:def 4;
consider b such that A4: b in dom f and A5: f.b = a by A3, FUNCT_1:def 3;
dom f = Polish-WFF-set(L, E)^^(E.t) by FUNCT_2:def 1;
then reconsider b as FinSequence by A4;
consider c such that A6: c in dom g and A7: g.c = a by A3, FUNCT_1:def 3;
dom g = Polish-WFF-set(L, E)^^(E.u) by FUNCT_2:def 1;
then reconsider c as FinSequence by A6;
t^b = f.b by A4, Def13
.= u^c by A5, A6, A7, Def13;
hence thesis by TH4;
end;
theorem
for L, E for t being Element of L
for a st a in dom Polish-operation(L, E, t) ex p st
p = Polish-operation(L, E, t).a & L-head p = t
proof
let L, E;
let t be Element of L;
let a;
assume A1: a in dom Polish-operation(L, E, t);
then a in Polish-WFF-set(L, E)^^E.t by FUNCT_2:def 1;
then reconsider q = a as FinSequence;
take t^q;
thus Polish-operation(L, E, t).a = t^q by A1, Def13;
thus thesis by Th17;
end;
theorem Th91:
for L, E for t being Element of L for F being Polish-WFF of L, E holds
Polish-WFF-head F = t
iff ex u being Element of Polish-WFF-set(L, E)^^(E.t)
st F = Polish-operation(L, E, t).u
proof
let L, E;
let t be Element of L;
let F be Polish-WFF of L, E;
set W = Polish-WFF-set(L, E);
set H = Polish-operation(L, E, t);
A2: dom H = W^^(E.t) by FUNCT_2:def 1;
thus Polish-WFF-head F = t implies ex u being Element of W^^(E.t) st F = H.u
proof
assume A3: Polish-WFF-head F = t;
set u = (L, E)-tail F;
reconsider u as Element of W^^(E.t) by A3;
take u;
thus F = t^u by A3, Def10 .= H.u by A2, Def13;
end;
given u being Element of W^^(E.t) such that A20: F = H.u;
reconsider u as FinSequence;
F = t^u by A2, A20, Def13;
hence Polish-WFF-head F = t by Th17;
end;
theorem
for L, E for t being Element of L st E.t = 1 for F being Polish-WFF of L, E
st Polish-WFF-head F = t ex G being Polish-WFF of L, E
st F = Polish-unOp(L, E, t).G
proof
let L, E;
let t be Element of L;
assume A1: E.t = 1;
let F be Polish-WFF of L, E;
assume A2: Polish-WFF-head F = t;
consider u being Element of Polish-WFF-set(L, E)^^1 such that
A3: F = Polish-operation(L, E, t).u by A1, A2, Th91;
reconsider G = u as Polish-WFF of L, E by Th8;
take G;
thus thesis by A1, A3, Def21;
end;
theorem Th93:
for L, E for t being Element of L st E.t = 1 for F being Polish-WFF of L, E
holds Polish-WFF-head(Polish-unOp(L, E, t).F) = t
& Polish-WFF-args(Polish-unOp(L, E, t).F) = <*F*>
proof
let L, E;
let t be Element of L;
assume A1: E.t = 1;
let F be Polish-WFF of L, E;
set W = Polish-WFF-set(L, E);
set H = Polish-unOp(L, E, t);
set G = H.F;
reconsider F1 = F as Element of W^^(E.t) by A1, Th8;
ex u being Element of W^^(E.t) st G = Polish-operation(L, E, t).u
proof
take u = F1;
thus thesis by A1, Def21;
end;
hence A3: Polish-WFF-head G = t by Th91;
G = Polish-operation(L, E, t).F1 by A1, Def21;
then L-tail G = F1 by Th65;
hence thesis by A1, A3, TH55;
end;
theorem
for L, E for t being Element of L st E.t = 2 for F being Polish-WFF of L, E
st Polish-WFF-head F = t ex G, H being Polish-WFF of L, E
st F = Polish-binOp(L, E, t).(G, H)
proof
let L, E;
let t be Element of L;
assume A1: E.t = 2;
let F be Polish-WFF of L, E;
assume A2: Polish-WFF-head F = t;
set W = Polish-WFF-set(L, E);
consider u being Element of W^^2
such that A3: F = Polish-operation(L, E, t).u by A1, A2, Th91;
W^^2 = W^^(1+1)
.= (W^^1)^W by Th7
.= W^W by Th8;
then consider G, H being FinSequence such that
A5: u = G^H and
A6: G in W and
A7: H in W by Def2;
reconsider G as Element of W by A6;
reconsider H as Element of W by A7;
take G, H;
thus thesis by A1, A3, A5, Def22;
end;
theorem
for L, E for t being Element of L st E.t = 2
for F, G being Polish-WFF of L, E
holds Polish-WFF-head(Polish-binOp(L, E, t).(F, G)) = t
& Polish-WFF-args(Polish-binOp(L, E, t).(F, G)) = <*F, G*>
proof
let L, E;
let t be Element of L;
assume A1: E.t = 2;
let F, G be Polish-WFF of L, E;
set W = Polish-WFF-set(L, E);
set H = Polish-binOp(L, E, t);
set K = Polish-operation(L, E, t);
set v = H.(F, G);
F in W & G in W;
then F in W^^1 & G in W^^1 by Th8;
then F^G in W^^(1+1) by Th12;
then reconsider u = F^G as Element of W^^(E.t) by A1;
A5: v = Polish-operation(L, E, t).u by A1, Def22;
hence Polish-WFF-head v = t by Th91;
hence thesis by A1, A5, Th56, Th65;
end;
theorem
for L, E for F being Polish-WFF of L, E holds
F in Polish-atoms(L, E) iff Polish-arity F = 0
proof
let L, E;
let F be Polish-WFF of L, E;
thus F in Polish-atoms(L, E) implies Polish-arity F = 0
proof
assume A1: F in Polish-atoms(L, E);
then F in L by Def9;
then Polish-WFF-head F = F by Th18;
hence Polish-arity F = 0 by A1, Def9;
end;
assume A10: Polish-arity F = 0;
then L-tail F in Polish-WFF-set(L, E)^^0 by Th62;
then L-tail F in {{}} by Th7;
then L-tail F = {} by TARSKI:def 1;
then F = (L-head F)^{} by Def10;
then F = Polish-WFF-head F by FINSEQ_1:34;
hence F in Polish-atoms(L, E) by A10, Def9;
end;
theorem
for L, E, D, g for K being Function of Polish-WFF-set(L, E), D
for t being Element of L for F being Polish-WFF of L, E
st K is g-recursive & E.t = 1 holds
K.(Polish-unOp(L, E, t).F) = g.(t, <*K.F*>)
proof
let L, E, D, g;
set W = Polish-WFF-set(L, E);
let K be Function of W, D;
let t be Element of L;
let F be Polish-WFF of L, E;
assume that
A1: K is g-recursive and
A2: E.t = 1;
set G = Polish-unOp(L, E, t).F;
reconsider G1 = G as Element of W;
A3: dom K = W by FUNCT_2:def 1;
Polish-WFF-args G1 = <*F*> by A2, Th93;
then A5: K * Polish-WFF-args G1 = <*K.F*> by A3, FINSEQ_2:34;
thus K.G = g.[L-head G1, K * (Polish-WFF-args G1)] by A1
.= g.[t, K * Polish-WFF-args G1] by A2, Th93
.= g.(t, <*K.F*>) by A5, BINOP_1:def 1;
end;
definition
let S;
let p be FinSequence of S;
func FlattenSeq p -> Element of S^^(len p) means
:Def102:
decomp( S, len p, it ) = p;
existence
proof
defpred X[ set ] means
ex q being FinSequence of S st ex r being Element of S^^(len q)
st q = $1 & decomp( S, len q, r ) = q;
A1: X[<*>S]
proof
take q = <*>S;
reconsider r = {} as Element of S^^(len q) by Th4;
take r;
thus thesis by Th51;
end;
A10: for s being FinSequence of S for t being Element of S st X[ s ]
holds X[ s^<*t*> ]
proof
let s be FinSequence of S;
let t be Element of S;
set n = len s;
set q = s^<*t*>;
assume A11: X[ s ];
take q;
consider q1 being FinSequence of S such that
A12: ex r1 being Element of S^^(len q1)
st q1 = s & decomp(S, len q1, r1) = q1 by A11;
consider r1 being Element of S^^(len q1) such that
A13: q1 = s and
A14: decomp(S, len q1, r1) = q1 by A12;
set r = r1^t;
A15: len q = n + len <*t*> by FINSEQ_1:22 .= n+1 by FINSEQ_1:39;
r in (S^^n)^S by A13, Def2;
then reconsider r as Element of S^^(len q) by A15, Th7;
take r;
thus q = s^<*t*>;
set q2 = decomp(S, len q, r);
A20: len q2 = len q by Th54;
for k st 1 <= k & k <= len q holds q.k = q2.k
proof
let k;
assume that
A21: 1 <= k and
A22: k <= len q;
k in Seg len q by A21, A22, FINSEQ_1:1;
then consider i such that
A23: k = i+1 and
A24: q2.k = S-head((S^^i)-tail r) by Def32;
per cases;
suppose A30: k <= n;
then A31: k in Seg n by A21, FINSEQ_1:1;
then consider j such that
A32: k = j+1 and
A33: q1.k = S-head((S^^j)-tail r1) by A13, A14, Def32;
A34: k in dom s by A31, FINSEQ_1:def 3;
A35: r1 is (S^^i)-headed & (S^^i)-tail r1 is S-headed
by A13, A23, A30, Th22;
then A36: (S^^i)-tail r = ((S^^i)-tail r1)^t by Th21;
thus q.k = S-head((S^^i)-tail r1)
by A13, A23, A32, A33, A34, FINSEQ_1:def 7
.= q2.k by A24, A35, A36, Th21;
end;
suppose k > n;
then A40: k = n+1 by A15, A22, NAT_1:8;
hence q2.k = S-head t by A13, A23, A24, Th17
.= t by Th18
.= q.k by A40, FINSEQ_1:42;
end;
end;
hence decomp(S, len q, r) = q by A20;
end;
for q being FinSequence of S holds X[ q ] from FINSEQ_2:sch 2(A1, A10);
then X[ p ];
hence thesis;
end;
uniqueness
proof
set n = len p;
let q1, q2 be Element of S^^n;
assume that
A1: decomp(S, n, q1) = p and
A2: decomp(S, n, q2) = p;
defpred X[ Nat ] means $1 <= n implies (S^^$1)-head q1 = (S^^$1)-head q2;
A3: X[ 0 ]
proof
assume 0 <= n;
thus (S^^0)-head q1 = {} by Th23 .= (S^^0)-head q2 by Th23;
end;
A10: for k st X[ k ] holds X[ k+1 ]
proof
let k;
assume A11: k <= n implies (S^^k)-head q1 = (S^^k)-head q2;
set r = (S^^k)-head q1;
set s1 = (S^^k)-tail q1;
set s2 = (S^^k)-tail q2;
set t1 = S-head s1;
set t2 = S-head s2;
set u1 = S-tail s1;
set u2 = S-tail s2;
assume A12: k+1 <= n;
1 <= k+1 by NAT_1:11;
then A13: k+1 in Seg n by A12, FINSEQ_1:1;
then consider i such that
A14: k+1 = i+1 and
A15: p.(k+1) = S-head((S^^i)-tail q1) by A1, Def32;
consider j such that
A16: k+1 = j+1 and
A17: p.(k+1) = S-head((S^^j)-tail q2) by A2, A13, Def32;
k <= k+1 by NAT_1:11;
then A18: r = (S^^k)-head q2 by A11, A12, XXREAL_0:2;
q1 is (S^^k)-headed & s1 is S-headed by A12, Th22;
then r in S^^k & t1 in S by Def9a;
then r^t1 in (S^^k)^S by Def2;
then A20: r^t1 in S^^(k+1) by Th7;
q1 = r^s1 by Def10
.= r^(t1^u1) by Def10
.= (r^t1)^u1 by FINSEQ_1:32;
then A21: (S^^(k+1))-head q1 = r^t1 by A20, Th17;
q2 is (S^^k)-headed & s2 is S-headed by A12, Th22;
then r in S^^k & t2 in S by A18, Def9a;
then r^t2 in (S^^k)^S by Def2;
then A22: r^t2 in S^^(k+1) by Th7;
q2 = r^s2 by A18, Def10
.= r^(t2^u2) by Def10
.= (r^t2)^u2 by FINSEQ_1:32;
then (S^^(k+1))-head q2 = r^t2 by A22, Th17;
hence thesis by A14, A15, A16, A17, A21;
end;
for k holds X[ k ] from NAT_1:sch 2(A3, A10);
then A30: (S^^n)-head q1 = (S^^n)-head q2;
thus q1 = (S^^n)-head q1 by Th18 .= q2 by A30, Th18;
end;
end;
definition
let L, E;
mode Substitution of L, E is
PartFunc of Polish-atoms(L, E), Polish-WFF-set(L, E);
end;
definition
let L, E;
let s be Substitution of L, E;
func Subst s -> Polish-recursion-function of E, Polish-WFF-set(L, E) means
:Def103:
for t being Element of L, p being FinSequence of Polish-WFF-set(L, E)
st len p = E.t holds
(t in dom s implies it.(t,p) = s.t) &
(not t in dom s implies it.(t,p) = t^(FlattenSeq p));
existence
proof
set W = Polish-WFF-set(L, E);
set R = Polish-recursion-domain(E, W);
defpred X[object, object] means
ex t being Element of L, p being FinSequence of W st
$1 = [t, p] &
(t in dom s implies $2 = s.t) &
(not t in dom s implies $2 = t^(FlattenSeq p));
A1: for a st a in R ex b st b in W & X[a, b]
proof
let a;
assume a in R;
then consider t being Element of L, p being FinSequence of W such that
A3: a = [t, p] and
A4: len p = E.t;
per cases;
suppose A10: t in dom s;
take b = s.t;
thus b in W by A10, PARTFUN1:4;
take t, p;
thus a = [t, p] by A3;
thus t in dom s implies b = s.t;
thus thesis by A10;
end;
suppose A12: not t in dom s;
set u = FlattenSeq p;
take b = t^u;
u in W^^(E.t) by A4;
then u in dom Polish-operation(L, E, t) by FUNCT_2:def 1;
then b = Polish-operation(L, E, t).u by Def13;
hence b in W by A4, FUNCT_2:5;
take t, p;
thus a = [t, p] by A3;
thus t in dom s implies b = s.t by A12;
thus thesis;
end;
end;
consider f being Function of R, W such that
A20: for a st a in R holds X[a, f.a] from FUNCT_2:sch 1(A1);
take f;
let t be Element of L;
let p be FinSequence of W;
set a = [t,p];
assume len p = E.t;
then A21: a in R;
f.(t,p) = f.a by BINOP_1:def 1;
then consider t1 being Element of L, p1 being FinSequence of W such that
A23: a = [t1, p1] and
A24: (t1 in dom s implies f.(t,p) = s.t1) and
A25: (not t1 in dom s implies f.(t,p) = t1^(FlattenSeq p1)) by A20, A21;
t1 = t & p1 = p by A23, XTUPLE_0:1;
hence thesis by A24, A25;
end;
uniqueness
proof
set W = Polish-WFF-set(L, E);
set R = Polish-recursion-domain(E, W);
let f, g be Function of R, W;
assume that
A1: for t being Element of L, p being FinSequence of W st len p = E.t
holds
(t in dom s implies f.(t,p) = s.t) &
(not t in dom s implies f.(t,p) = t^(FlattenSeq p)) and
A2: for t being Element of L, p being FinSequence of W st len p = E.t
holds
(t in dom s implies g.(t,p) = s.t) &
(not t in dom s implies g.(t,p) = t^(FlattenSeq p));
A3: dom f = R by FUNCT_2:def 1 .= dom g by FUNCT_2:def 1;
for a st a in dom f holds f.a = g.a
proof
let a;
assume a in dom f;
then a in R by FUNCT_2:def 1;
then consider t being Element of L, p being FinSequence of W such that
A6: a = [t, p] and
A7: len p = E.t;
A8: f.a = f.(t,p) by A6, BINOP_1:def 1;
A9: g.a = g.(t,p) by A6, BINOP_1:def 1;
per cases;
suppose A20: t in dom s;
hence f.a = s.t by A1, A7, A8
.= g.a by A2, A7, A9, A20;
end;
suppose A22: not t in dom s;
hence f.a = t^FlattenSeq p by A1, A7, A8
.= g.a by A2, A7, A9, A22;
end;
end;
hence f = g by A3, FUNCT_1:2;
end;
end;
definition
let L, E;
let s be Substitution of L, E;
let F be Polish-WFF of L, E;
func Subst(s, F) -> Polish-WFF of L, E means
:Def104:
ex H being Function of Polish-WFF-set(L, E), Polish-WFF-set(L, E)
st H is (Subst s)-recursive & it = H.F;
existence
proof
set W = Polish-WFF-set(L, E);
consider H being Function of W, W such that
A1: H is (Subst s)-recursive by Th77;
take G = H.F;
take H;
thus thesis by A1;
end;
uniqueness by Th72;
end;
theorem
for L, E for s being Substitution of L, E for F being Polish-WFF of L, E
st s = {} holds Subst(s, F) = F
proof
let L, E;
let s be Substitution of L, E;
let F be Polish-WFF of L, E;
assume A1: s = {};
set W = Polish-WFF-set(L, E);
set g = Subst s;
set K = id W;
reconsider K as Function;
dom K = W & for a st a in W holds K.a in W by FUNCT_1:17;
then reconsider K as Function of W, W by FUNCT_2:3;
A2: K is g-recursive
proof
let G be Polish-WFF of L, E;
set t = L-head G;
set p = Polish-WFF-args G;
set q = (L, E)-tail G;
A4: len p = E.t by Th54;
A6: not t in dom s by A1;
A7: K * p = p
proof
reconsider q = K * p as FinSequence of W by FINSEQ_2:32;
A10: len p = len q by FINSEQ_2:33;
A11: dom p = Seg len p by FINSEQ_1:def 3
.= dom q by A10, FINSEQ_1:def 3;
for k st k in dom p holds p.k = q.k
proof
let k;
assume A12: k in dom p;
rng p c= W by FINSEQ_1:def 4;
then A14: p.k in W by A12, FUNCT_1:3;
thus p.k = K.(p.k) by A14, FUNCT_1:17
.= q.k by A12, FUNCT_1:13;
end;
hence thesis by A11, FINSEQ_1:13;
end;
thus K.G = t^q by Def10
.= t^(FlattenSeq p) by A4, Def102
.= g.(t,p) by A4, A6, Def103
.= g.[ L-head G, K * (Polish-WFF-args G) ] by A7, BINOP_1:def 1;
end;
F = K.F;
hence thesis by A2, Def104;
end;