let P be Instruction-Sequence of SCMPDS; :: thesis:
let s be State of SCMPDS; :: thesis:
let I be halt-free shiftable Program of SCMPDS; :: thesis:
let a be Int_position ; :: thesis:
let k1 be Integer; :: thesis:
set b = DataLoc ((s . a),k1);
set IF = if>=0 (a,k1,I);
set pIF = stop (if>=0 (a,k1,I));
set pI = stop I;
set s2 = Initialize s;
set s3 = Initialize s;
set P2 = P +* (stop I);
set P3 = P +* (stop (if>=0 (a,k1,I)));
set s4 = Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1);
set P4 = P +* (stop (if>=0 (a,k1,I)));
set i = (a,k1) >=0_goto 2;
set j = goto ((card I) + 1);
set SAl = Start-At (((card I) + 2),SCMPDS);
A3: if>=0 (a,k1,I) = ((a,k1) >=0_goto 2) ';' ((goto ((card I) + 1)) ';' I) by SCMPDS_4:16;
UU: stop I c= P +* (stop I) by FUNCT_4:25;
A4: Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),(0 + 1)) = Following ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),0))) by EXTPRO_1:3
.= Following ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s)) by EXTPRO_1:2
.= Exec (((a,k1) >=0_goto 2),(Initialize s)) by A3, Th22 ;
A5: not DataLoc ((s . a),k1) in dom (Start-At (0,SCMPDS)) by SCMPDS_4:18;
not a in dom (Start-At (0,SCMPDS)) by SCMPDS_4:18;
then A6: (Initialize s) . (DataLoc (((Initialize s) . a),k1)) = (Initialize s) . (DataLoc ((s . a),k1)) by FUNCT_4:11
.= s . (DataLoc ((s . a),k1)) by A5, FUNCT_4:11 ;
A7: IC (Initialize s) = 0 by MEMSTR_0:47;
A8: ( Start-At (0,SCMPDS) c= Initialize s & Shift ((stop I),2) c= P +* (stop (if>=0 (a,k1,I))) ) by Lm7, FUNCT_4:25;
for a being Int_position holds (Initialize s) . a = (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)) . a by A4, SCMPDS_2:57;
then A10: DataPart (Initialize s) = DataPart (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)) by SCMPDS_4:8;
assume s . (DataLoc ((s . a),k1)) >= 0 ; :: thesis:
then A11: IC (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)) = ICplusConst ((Initialize s),2) by A4, A6, SCMPDS_2:57
.= 0 + 2 by A7, Th23 ;
assume A13: I is_closed_on s,P ; :: thesis:
then A14: I is_closed_on Initialize s,P +* (stop I) by Th38;
assume A15: I is_halting_on s,P ; :: thesis:
then A16: P +* (stop I) halts_on Initialize s by Def3;
A18: Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),((LifeSpan ((P +* (stop I)),(Initialize s))) + 1)) = Comput ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)),(LifeSpan ((P +* (stop I)),(Initialize s)))) by EXTPRO_1:4;
A21: CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),((LifeSpan ((P +* (stop I)),(Initialize s))) + 1)))) = CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)),(LifeSpan ((P +* (stop I)),(Initialize s)))))) by A18
.= CurInstr ((P +* (stop I)),(Comput ((P +* (stop I)),(Initialize s),(LifeSpan ((P +* (stop I)),(Initialize s)))))) by A14, A8, A11, A10, Th45, UU
.= halt SCMPDS by A16, EXTPRO_1:def 15 ;
then A22: P +* (stop (if>=0 (a,k1,I))) halts_on Initialize s by EXTPRO_1:29;
A23: CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s)) = (a,k1) >=0_goto 2 by A3, Th22;

now

let l be Element of NAT ; :: thesis:
assume A24: l < (LifeSpan ((P +* (stop I)),(Initialize s))) + 1 ; :: thesis:
A25: Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),0) = Initialize s by EXTPRO_1:2;

per cases ;

suppose l = 0 ; :: thesis:

then CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),l))) = CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s)) by A25;
hence CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),l))) <> halt SCMPDS by A23; :: thesis:

end;

suppose l <> 0 ; :: thesis:

then consider n being Nat such that
A26: l = n + 1 by NAT_1:6;
reconsider n = n as Element of NAT by ORDINAL1:def 12;
A27: n < LifeSpan ((P +* (stop I)),(Initialize s)) by A24, A26, XREAL_1:6;
assume A28: CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),l))) = halt SCMPDS ; :: thesis:
A30: Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),(n + 1)) = Comput ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)),n) by EXTPRO_1:4;
CurInstr ((P +* (stop I)),(Comput ((P +* (stop I)),(Initialize s),n))) = CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)),n))) by A14, A8, A11, A10, Th45, UU
.= halt SCMPDS by A26, A28, A30 ;
hence contradiction by A16, A27, EXTPRO_1:def 15; :: thesis:

end;

end;

end;

then for l being Element of NAT st CurInstr ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),l))) = halt SCMPDS holds
(LifeSpan ((P +* (stop I)),(Initialize s))) + 1 <= l ;
then A33: LifeSpan ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s)) = (LifeSpan ((P +* (stop I)),(Initialize s))) + 1 by A21, A22, EXTPRO_1:def 15;
A35: DataPart (Result ((P +* (stop I)),(Initialize s))) = DataPart (Comput ((P +* (stop I)),(Initialize s),(LifeSpan ((P +* (stop I)),(Initialize s))))) by A16, EXTPRO_1:23
.= DataPart (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)),(LifeSpan ((P +* (stop I)),(Initialize s))))) by A14, A8, A11, A10, Th45, UU
.= DataPart (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),((LifeSpan ((P +* (stop I)),(Initialize s))) + 1))) by EXTPRO_1:4
.= DataPart (Result ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s))) by A22, A33, EXTPRO_1:23 ;

A36: now

let x be set ; :: thesis:
A37: dom (Start-At (((card I) + 2),SCMPDS)) = {(IC )} by FUNCOP_1:13;
assume A38: x in dom (IExec ((if>=0 (a,k1,I)),P,(Initialize s))) ; :: thesis:

per cases by A38, SCMPDS_4:6;

suppose A39: x is Int_position ; :: thesis:

then x <> IC by SCMPDS_2:43;
then A40: not x in dom (Start-At (((card I) + 2),SCMPDS)) by A37, TARSKI:def 1;
thus (IExec ((if>=0 (a,k1,I)),P,(Initialize s))) . x = (Result ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s))) . x
.= (Result ((P +* (stop I)),(Initialize s))) . x by A35, A39, SCMPDS_4:8
.= (IExec (I,P,(Initialize s))) . x
.= ((IExec (I,P,(Initialize s))) +* (Start-At (((card I) + 2),SCMPDS))) . x by A40, FUNCT_4:11 ; :: thesis:

end;

suppose A42: x = IC ; :: thesis:

A44: IC (Result ((P +* (stop I)),(Initialize s))) = IC (IExec (I,P,(Initialize s)))
.= card I by A13, A15, Th48 ;
A45: x in dom (Start-At (((card I) + 2),SCMPDS)) by A37, A42, TARSKI:def 1;
thus (IExec ((if>=0 (a,k1,I)),P,(Initialize s))) . x = (Result ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s))) . x
.= (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),((LifeSpan ((P +* (stop I)),(Initialize s))) + 1))) . x by A22, A33, EXTPRO_1:23
.= IC (Comput ((P +* (stop (if>=0 (a,k1,I)))),(Comput ((P +* (stop (if>=0 (a,k1,I)))),(Initialize s),1)),(LifeSpan ((P +* (stop I)),(Initialize s))))) by A42, EXTPRO_1:4
.= (IC (Comput ((P +* (stop I)),(Initialize s),(LifeSpan ((P +* (stop I)),(Initialize s)))))) + 2 by A14, A8, A11, A10, Th45, UU
.= (IC (Result ((P +* (stop I)),(Initialize s)))) + 2 by A16, EXTPRO_1:23
.= IC (Start-At (((card I) + 2),SCMPDS)) by A44, FUNCOP_1:72
.= ((IExec (I,P,(Initialize s))) +* (Start-At (((card I) + 2),SCMPDS))) . x by A42, A45, FUNCT_4:13 ; :: thesis:

end;

end;

end;

dom (IExec ((if>=0 (a,k1,I)),P,(Initialize s))) = the carrier of SCMPDS by PARTFUN1:def 2
.= dom ((IExec (I,P,(Initialize s))) +* (Start-At (((card I) + 2),SCMPDS))) by PARTFUN1:def 2 ;
hence IExec ((if>=0 (a,k1,I)),P,(Initialize s)) = (IExec (I,P,(Initialize s))) +* (Start-At (((card I) + 2),SCMPDS)) by A36, FUNCT_1:2; :: thesis: