let s1, s2 be State of SCM+FSA; :: thesis: for I being parahalting Program of SCM+FSA st I +* (Start-At (0,SCM+FSA)) c= s1 & I +* (Start-At (0,SCM+FSA)) c= s2 & s1,s2 equal_outside NAT holds
( LifeSpan ((ProgramPart s1),s1) = LifeSpan ((ProgramPart s2),s2) & Result ((ProgramPart s1),s1), Result ((ProgramPart s2),s2) equal_outside NAT )
let I be parahalting Program of SCM+FSA; :: thesis: ( I +* (Start-At (0,SCM+FSA)) c= s1 & I +* (Start-At (0,SCM+FSA)) c= s2 & s1,s2 equal_outside NAT implies ( LifeSpan ((ProgramPart s1),s1) = LifeSpan ((ProgramPart s2),s2) & Result ((ProgramPart s1),s1), Result ((ProgramPart s2),s2) equal_outside NAT ) )
assume that
A1: I +* (Start-At (0,SCM+FSA)) c= s1 and
A2: I +* (Start-At (0,SCM+FSA)) c= s2 and
A3: s1,s2 equal_outside NAT ; :: thesis: ( LifeSpan ((ProgramPart s1),s1) = LifeSpan ((ProgramPart s2),s2) & Result ((ProgramPart s1),s1), Result ((ProgramPart s2),s2) equal_outside NAT )
A4: ProgramPart s2 halts_on s2 by A2, Th18;
A5: ProgramPart s1 halts_on s1 by A1, Th18;

A6: now

let l be Element of NAT ; :: thesis: ( CurInstr ((ProgramPart s2),(Comput ((ProgramPart s2),s2,l))) = halt SCM+FSA implies LifeSpan ((ProgramPart s1),s1) <= l )
TX: ProgramPart s2 = ProgramPart (Comput ((ProgramPart s2),s2,l)) by AMI_1:123;
TY: ProgramPart s1 = ProgramPart (Comput ((ProgramPart s1),s1,l)) by AMI_1:123;
assume A7: CurInstr ((ProgramPart s2),(Comput ((ProgramPart s2),s2,l))) = halt SCM+FSA ; :: thesis: LifeSpan ((ProgramPart s1),s1) <= l
CurInstr ((ProgramPart s1),(Comput ((ProgramPart s1),s1,l))) = CurInstr ((ProgramPart s2),(Comput ((ProgramPart s2),s2,l))) by A1, A2, A3, Th28, TX, TY;
hence LifeSpan ((ProgramPart s1),s1) <= l by A5, A7, EXTPRO_1:def 14; :: thesis: verum

end;

TL: ProgramPart s2 = ProgramPart (Comput ((ProgramPart s2),s2,(LifeSpan ((ProgramPart s1),s1)))) by AMI_1:123;
TL1: ProgramPart s1 = ProgramPart (Comput ((ProgramPart s1),s1,(LifeSpan ((ProgramPart s1),s1)))) by AMI_1:123;
CurInstr ((ProgramPart s2),(Comput ((ProgramPart s2),s2,(LifeSpan ((ProgramPart s1),s1))))) = CurInstr ((ProgramPart s1),(Comput ((ProgramPart s1),s1,(LifeSpan ((ProgramPart s1),s1))))) by A1, A2, A3, Th28, TL, TL1
.= halt SCM+FSA by A5, EXTPRO_1:def 14 ;
hence K: LifeSpan ((ProgramPart s1),s1) = LifeSpan ((ProgramPart s2),s2) by A6, A4, EXTPRO_1:def 14; :: thesis: Result ((ProgramPart s1),s1), Result ((ProgramPart s2),s2) equal_outside NAT
ProgramPart s2 halts_on s2 by A2, Th18;
then A8: Result ((ProgramPart s2),s2) = Comput ((ProgramPart s2),s2,(LifeSpan ((ProgramPart s1),s1))) by K, EXTPRO_1:23;
ProgramPart s1 halts_on s1 by A1, Th18;
then Result ((ProgramPart s1),s1) = Comput ((ProgramPart s1),s1,(LifeSpan ((ProgramPart s1),s1))) by EXTPRO_1:23;
hence Result ((ProgramPart s1),s1), Result ((ProgramPart s2),s2) equal_outside NAT by A1, A2, A3, A8, Th28; :: thesis: verum