let F be NAT -defined the InstructionsF of SCM -valued total Function; :: thesis: ( <%(SubFrom ((),(dl. 1)))%> ^ <%()%> c= F implies for i1, i2 being Integer
for s being 0 -started State-consisting of <%i1,i2%> holds
( F halts_on s & LifeSpan (F,s) = 1 & (Result (F,s)) . () = i1 - i2 & ( for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d ) ) )

assume A1: <%(SubFrom ((),(dl. 1)))%> ^ <%()%> c= F ; :: thesis: for i1, i2 being Integer
for s being 0 -started State-consisting of <%i1,i2%> holds
( F halts_on s & LifeSpan (F,s) = 1 & (Result (F,s)) . () = i1 - i2 & ( for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d ) )

let i1, i2 be Integer; :: thesis: for s being 0 -started State-consisting of <%i1,i2%> holds
( F halts_on s & LifeSpan (F,s) = 1 & (Result (F,s)) . () = i1 - i2 & ( for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d ) )

let s be 0 -started State-consisting of <%i1,i2%>; :: thesis: ( F halts_on s & LifeSpan (F,s) = 1 & (Result (F,s)) . () = i1 - i2 & ( for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d ) )

set s0 = Comput (F,s,0);
set s1 = Comput (F,s,(0 + 1));
A2: s = Comput (F,s,0) by EXTPRO_1:2;
A3: ( s . () = i1 & s . (dl. 1) = i2 ) by Th2;
A4: IC s = 0 by MEMSTR_0:def 11;
A5: F . 0 = SubFrom ((),(dl. 1)) by ;
then A6: IC (Comput (F,s,(0 + 1))) = 0 + 1 by A4, A2, Th6;
A7: F . 1 = halt SCM by ;
hence F halts_on s by ; :: thesis: ( LifeSpan (F,s) = 1 & (Result (F,s)) . () = i1 - i2 & ( for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d ) )

thus LifeSpan (F,s) = 1 by ; :: thesis: ( (Result (F,s)) . () = i1 - i2 & ( for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d ) )

(Comput (F,s,(0 + 1))) . () = ((Comput (F,s,0)) . ()) - ((Comput (F,s,0)) . (dl. 1)) by A4, A5, A2, Th6;
hence (Result (F,s)) . () = i1 - i2 by ; :: thesis: for d being Data-Location st d <> dl. 0 holds
(Result (F,s)) . d = s . d

let d be Data-Location; :: thesis: ( d <> dl. 0 implies (Result (F,s)) . d = s . d )
assume A8: d <> dl. 0 ; :: thesis: (Result (F,s)) . d = s . d
thus (Result (F,s)) . d = (Comput (F,s,(0 + 1))) . d by
.= s . d by A4, A5, A2, A8, Th6 ; :: thesis: verum