:: by Henryk Oryszczyszyn and Krzysztof Pra\.zmowski

::

:: Received April 13, 1990

:: Copyright (c) 1990-2021 Association of Mizar Users

definition

let AP be AffinPlane;

end;
attr AP is satisfying_PPAP means :: AFF_2:def 1

for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9;

for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9;

:: deftheorem defines satisfying_PPAP AFF_2:def 1 :

for AP being AffinPlane holds

( AP is satisfying_PPAP iff for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9 );

for AP being AffinPlane holds

( AP is satisfying_PPAP iff for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9 );

definition

let AP be AffinSpace;

end;
attr AP is Pappian means :: AFF_2:def 2

for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9;

for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9;

:: deftheorem defines Pappian AFF_2:def 2 :

for AP being AffinSpace holds

( AP is Pappian iff for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9 );

for AP being AffinSpace holds

( AP is Pappian iff for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9 );

definition

let AP be AffinPlane;

end;
attr AP is satisfying_PAP_1 means :: AFF_2:def 3

for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & b <> c holds

a9 in N;

for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & b <> c holds

a9 in N;

:: deftheorem defines satisfying_PAP_1 AFF_2:def 3 :

for AP being AffinPlane holds

( AP is satisfying_PAP_1 iff for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & b <> c holds

a9 in N );

for AP being AffinPlane holds

( AP is satisfying_PAP_1 iff for M, N being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & M <> N & o in M & o in N & o <> a & o <> a9 & o <> b & o <> b9 & o <> c & o <> c9 & a in M & b in M & c in M & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & b <> c holds

a9 in N );

definition

let AP be AffinSpace;

end;
attr AP is Desarguesian means :: AFF_2:def 4

for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9;

for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9;

:: deftheorem defines Desarguesian AFF_2:def 4 :

for AP being AffinSpace holds

( AP is Desarguesian iff for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9 );

for AP being AffinSpace holds

( AP is Desarguesian iff for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9 );

definition

let AP be AffinPlane;

end;
attr AP is satisfying_DES_1 means :: AFF_2:def 5

for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

o in C;

for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

o in C;

:: deftheorem defines satisfying_DES_1 AFF_2:def 5 :

for AP being AffinPlane holds

( AP is satisfying_DES_1 iff for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

o in C );

for AP being AffinPlane holds

( AP is satisfying_DES_1 iff for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

o in C );

definition

let AP be AffinPlane;

end;
attr AP is satisfying_DES_2 means :: AFF_2:def 6

for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 holds

c9 in C;

for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 holds

c9 in C;

:: deftheorem defines satisfying_DES_2 AFF_2:def 6 :

for AP being AffinPlane holds

( AP is satisfying_DES_2 iff for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 holds

c9 in C );

for AP being AffinPlane holds

( AP is satisfying_DES_2 iff for A, P, C being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st o in A & o in P & o in C & o <> a & o <> b & o <> c & a in A & a9 in A & b in P & b9 in P & c in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 holds

c9 in C );

:: deftheorem defines Moufangian AFF_2:def 7 :

for AP being AffinSpace holds

( AP is Moufangian iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & c9 in K & not a in K & o <> c & a <> b & LIN o,a,a9 & LIN o,b,b9 & a,b // a9,b9 & a,c // a9,c9 & a,b // K holds

b,c // b9,c9 );

for AP being AffinSpace holds

( AP is Moufangian iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & c9 in K & not a in K & o <> c & a <> b & LIN o,a,a9 & LIN o,b,b9 & a,b // a9,b9 & a,c // a9,c9 & a,b // K holds

b,c // b9,c9 );

:: deftheorem defines satisfying_TDES_1 AFF_2:def 8 :

for AP being AffinPlane holds

( AP is satisfying_TDES_1 iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & c9 in K & not a in K & o <> c & a <> b & LIN o,a,a9 & a,b // a9,b9 & b,c // b9,c9 & a,c // a9,c9 & a,b // K holds

LIN o,b,b9 );

for AP being AffinPlane holds

( AP is satisfying_TDES_1 iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & c9 in K & not a in K & o <> c & a <> b & LIN o,a,a9 & a,b // a9,b9 & b,c // b9,c9 & a,c // a9,c9 & a,b // K holds

LIN o,b,b9 );

:: deftheorem defines satisfying_TDES_2 AFF_2:def 9 :

for AP being AffinPlane holds

( AP is satisfying_TDES_2 iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & c9 in K & not a in K & o <> c & a <> b & LIN o,a,a9 & LIN o,b,b9 & b,c // b9,c9 & a,c // a9,c9 & a,b // K holds

a,b // a9,b9 );

for AP being AffinPlane holds

( AP is satisfying_TDES_2 iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & c9 in K & not a in K & o <> c & a <> b & LIN o,a,a9 & LIN o,b,b9 & b,c // b9,c9 & a,c // a9,c9 & a,b // K holds

a,b // a9,b9 );

:: deftheorem defines satisfying_TDES_3 AFF_2:def 10 :

for AP being AffinPlane holds

( AP is satisfying_TDES_3 iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & not a in K & o <> c & a <> b & LIN o,a,a9 & LIN o,b,b9 & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & a,b // K holds

c9 in K );

for AP being AffinPlane holds

( AP is satisfying_TDES_3 iff for K being Subset of AP

for o, a, b, c, a9, b9, c9 being Element of AP st K is being_line & o in K & c in K & not a in K & o <> c & a <> b & LIN o,a,a9 & LIN o,b,b9 & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & a,b // K holds

c9 in K );

definition

let AP be AffinSpace;

end;
attr AP is translational means :: AFF_2:def 11

for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & A // C & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9;

for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & A // C & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9;

:: deftheorem defines translational AFF_2:def 11 :

for AP being AffinSpace holds

( AP is translational iff for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & A // C & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9 );

for AP being AffinSpace holds

( AP is translational iff for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & A // C & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 holds

b,c // b9,c9 );

definition

let AP be AffinPlane;

end;
attr AP is satisfying_des_1 means :: AFF_2:def 12

for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

A // C;

for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

A // C;

:: deftheorem defines satisfying_des_1 AFF_2:def 12 :

for AP being AffinPlane holds

( AP is satisfying_des_1 iff for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

A // C );

for AP being AffinPlane holds

( AP is satisfying_des_1 iff for A, P, C being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st A // P & a in A & a9 in A & b in P & b9 in P & c in C & c9 in C & A is being_line & P is being_line & C is being_line & A <> P & A <> C & a,b // a9,b9 & a,c // a9,c9 & b,c // b9,c9 & not LIN a,b,c & c <> c9 holds

A // C );

definition

let AP be AffinSpace;

end;
attr AP is satisfying_pap means :: AFF_2:def 13

for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9;

for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9;

:: deftheorem defines satisfying_pap AFF_2:def 13 :

for AP being AffinSpace holds

( AP is satisfying_pap iff for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9 );

for AP being AffinSpace holds

( AP is satisfying_pap iff for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & c9 in N & a,b9 // b,a9 & b,c9 // c,b9 holds

a,c9 // c,a9 );

definition

let AP be AffinPlane;

end;
attr AP is satisfying_pap_1 means :: AFF_2:def 14

for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & a9 <> b9 holds

c9 in N;

for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & a9 <> b9 holds

c9 in N;

:: deftheorem defines satisfying_pap_1 AFF_2:def 14 :

for AP being AffinPlane holds

( AP is satisfying_pap_1 iff for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & a9 <> b9 holds

c9 in N );

for AP being AffinPlane holds

( AP is satisfying_pap_1 iff for M, N being Subset of AP

for a, b, c, a9, b9, c9 being Element of AP st M is being_line & N is being_line & a in M & b in M & c in M & M // N & M <> N & a9 in N & b9 in N & a,b9 // b,a9 & b,c9 // c,b9 & a,c9 // c,a9 & a9 <> b9 holds

c9 in N );

theorem Th10: :: AFF_2:10

for AP being AffinPlane holds

( AP is satisfying_PPAP iff ( AP is Pappian & AP is satisfying_pap ) )

( AP is satisfying_PPAP iff ( AP is Pappian & AP is satisfying_pap ) )

proof end;