let P be Instruction-Sequence of SCMPDS; :: thesis: for s being State of SCMPDS
for I being Program of
for a being Int_position
for k1 being Integer st s . (DataLoc ((s . a),k1)) >= 0 holds
( if<0 (a,k1,I) is_closed_on s,P & if<0 (a,k1,I) is_halting_on s,P )
let s be State of SCMPDS; :: thesis: for I being Program of
for a being Int_position
for k1 being Integer st s . (DataLoc ((s . a),k1)) >= 0 holds
( if<0 (a,k1,I) is_closed_on s,P & if<0 (a,k1,I) is_halting_on s,P )
let I be Program of ; :: thesis: for a being Int_position
for k1 being Integer st s . (DataLoc ((s . a),k1)) >= 0 holds
( if<0 (a,k1,I) is_closed_on s,P & if<0 (a,k1,I) is_halting_on s,P )
let a be Int_position; :: thesis: for k1 being Integer st s . (DataLoc ((s . a),k1)) >= 0 holds
( if<0 (a,k1,I) is_closed_on s,P & if<0 (a,k1,I) is_halting_on s,P )
let k1 be Integer; :: thesis: ( s . (DataLoc ((s . a),k1)) >= 0 implies ( if<0 (a,k1,I) is_closed_on s,P & if<0 (a,k1,I) is_halting_on s,P ) )
set b = DataLoc ((s . a),k1);
assume A1: s . (DataLoc ((s . a),k1)) >= 0 ; :: thesis: ( if<0 (a,k1,I) is_closed_on s,P & if<0 (a,k1,I) is_halting_on s,P )
set i = (a,k1) >=0_goto ((card I) + 1);
set IF = if<0 (a,k1,I);
set pIF = stop (if<0 (a,k1,I));
set s3 = Initialize s;
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)));
A2: IC (Initialize s) = 0 by MEMSTR_0:47;
A3: 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 A4: (Initialize s) . (DataLoc (((Initialize s) . a),k1)) = (Initialize s) . (DataLoc ((s . a),k1)) by FUNCT_4:11
.= s . (DataLoc ((s . a),k1)) by A3, FUNCT_4:11 ;
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 ((card I) + 1)),(Initialize s)) by Th3 ;
then A5: IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),1)) = ICplusConst ((Initialize s),((card I) + 1)) by A1, A4, SCMPDS_2:57
.= 0 + ((card I) + 1) by A2, Th4 ;
A6: card (if<0 (a,k1,I)) = (card I) + 1 by Th1;
then A7: (card I) + 1 in dom (stop (if<0 (a,k1,I))) by COMPOS_1:64;
A8: (P +* (stop (if<0 (a,k1,I)))) /. (IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),1))) = (P +* (stop (if<0 (a,k1,I)))) . (IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),1))) by PBOOLE:143;
stop (if<0 (a,k1,I)) c= P +* (stop (if<0 (a,k1,I))) by FUNCT_4:25;
then stop (if<0 (a,k1,I)) c= P +* (stop (if<0 (a,k1,I))) ;
then (P +* (stop (if<0 (a,k1,I)))) . ((card I) + 1) = (stop (if<0 (a,k1,I))) . ((card I) + 1) by A7, GRFUNC_1:2
.= halt SCMPDS by A6, COMPOS_1:64 ;
then A9: CurInstr ((P +* (stop (if<0 (a,k1,I)))),(Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),1))) = halt SCMPDS by A5, A8;

now :: thesis: for k being Nat holds IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),k)) in dom (stop (if<0 (a,k1,I)))

let k be Nat; :: thesis: IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),b₁)) in dom (stop (if<0 (a,k1,I)))

per cases ( 0 < k or k = 0 ) ;

suppose 0 < k ; :: thesis: IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),b₁)) in dom (stop (if<0 (a,k1,I)))

then 1 + 0 <= k by INT_1:7;
hence IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),k)) in dom (stop (if<0 (a,k1,I))) by A7, A5, A9, EXTPRO_1:5; :: thesis: verum

end;

suppose k = 0 ; :: thesis: IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),b₁)) in dom (stop (if<0 (a,k1,I)))

then Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),k) = Initialize s by EXTPRO_1:2;
hence IC (Comput ((P +* (stop (if<0 (a,k1,I)))),(Initialize s),k)) in dom (stop (if<0 (a,k1,I))) by A2, COMPOS_1:36; :: thesis: verum

end;

end;

end;

hence if<0 (a,k1,I) is_closed_on s,P ; :: thesis: if<0 (a,k1,I) is_halting_on s,P
P +* (stop (if<0 (a,k1,I))) halts_on Initialize s by A9, EXTPRO_1:29;
hence if<0 (a,k1,I) is_halting_on s,P ; :: thesis: verum