let s be State of SCMPDS ; :: thesis: for I being Program of SCMPDS
for a being Int_position
for i being Integer st s . (DataLoc (s . a),i) = 0 holds
( while<>0 a,i,I is_closed_on s & while<>0 a,i,I is_halting_on s )
let I be Program of SCMPDS ; :: thesis: for a being Int_position
for i being Integer st s . (DataLoc (s . a),i) = 0 holds
( while<>0 a,i,I is_closed_on s & while<>0 a,i,I is_halting_on s )
let a be Int_position ; :: thesis: for i being Integer st s . (DataLoc (s . a),i) = 0 holds
( while<>0 a,i,I is_closed_on s & while<>0 a,i,I is_halting_on s )
let i be Integer; :: thesis: ( s . (DataLoc (s . a),i) = 0 implies ( while<>0 a,i,I is_closed_on s & while<>0 a,i,I is_halting_on s ) )
set b = DataLoc (s . a),i;
assume A1: s . (DataLoc (s . a),i) = 0 ; :: thesis: ( while<>0 a,i,I is_closed_on s & while<>0 a,i,I is_halting_on s )
set WHL = while<>0 a,i,I;
set pWH = stop (while<>0 a,i,I);
set iWH = Initialized (stop (while<>0 a,i,I));
set s3 = s +* (Initialized (stop (while<>0 a,i,I)));
set s4 = Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1;
set s5 = Computation (s +* (Initialized (stop (while<>0 a,i,I)))),2;
A2: not DataLoc (s . a),i in dom (Initialized (stop (while<>0 a,i,I))) by SCMPDS_4:31;
not a in dom (Initialized (stop (while<>0 a,i,I))) by SCMPDS_4:31;
then A3: (s +* (Initialized (stop (while<>0 a,i,I)))) . (DataLoc ((s +* (Initialized (stop (while<>0 a,i,I)))) . a),i) = (s +* (Initialized (stop (while<>0 a,i,I)))) . (DataLoc (s . a),i) by FUNCT_4:12
.= 0 by A1, A2, FUNCT_4:12 ;
set i1 = a,i <>0_goto 2;
set i2 = goto ((card I) + 2);
set i3 = goto (- ((card I) + 2));
A4: IC (s +* (Initialized (stop (while<>0 a,i,I)))) = inspos 0 by SCMPDS_6:21;
A5: while<>0 a,i,I = (a,i <>0_goto 2) ';' (((goto ((card I) + 2)) ';' I) ';' (goto (- ((card I) + 2)))) by Lm10;
Computation (s +* (Initialized (stop (while<>0 a,i,I)))),(0 + 1) = Following (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),0 ) by AMI_1:14
.= Following (s +* (Initialized (stop (while<>0 a,i,I)))) by AMI_1:13
.= Exec (a,i <>0_goto 2),(s +* (Initialized (stop (while<>0 a,i,I)))) by A5, SCMPDS_6:22 ;
then A6: IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1) = Next (IC (s +* (Initialized (stop (while<>0 a,i,I))))) by A3, SCMPDS_2:67
.= inspos (0 + 1) by A4 ;
A7: Initialized (stop (while<>0 a,i,I)) c= s +* (Initialized (stop (while<>0 a,i,I))) by FUNCT_4:26;
then A8: stop (while<>0 a,i,I) c= Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1 by AMI_1:81, SCMPDS_4:57;
A9: inspos 1 in dom (while<>0 a,i,I) by Th14;
then inspos 1 in dom (stop (while<>0 a,i,I)) by SCMPDS_6:18;
then A10: (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1) . (inspos 1) = (stop (while<>0 a,i,I)) . (inspos 1) by A8, GRFUNC_1:8
.= (while<>0 a,i,I) . (inspos 1) by A9, SCMPDS_6:19
.= goto ((card I) + 2) by Th15 ;
A11: card (while<>0 a,i,I) = (card I) + 3 by Th12;
then A12: inspos ((card I) + 3) in dom (stop (while<>0 a,i,I)) by SCMPDS_6:25;
Computation (s +* (Initialized (stop (while<>0 a,i,I)))),(1 + 1) = Following (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1) by AMI_1:14
.= Exec (goto ((card I) + 2)),(Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1) by A6, A10 ;
then A13: IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),2) = ICplusConst (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),1),((card I) + 2) by SCMPDS_2:66
.= inspos (((card I) + 2) + 1) by A6, SCMPDS_6:23
.= inspos ((card I) + (2 + 1)) ;
stop (while<>0 a,i,I) c= Computation (s +* (Initialized (stop (while<>0 a,i,I)))),2 by A7, AMI_1:81, SCMPDS_4:57;
then (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),2) . (inspos ((card I) + 3)) = (stop (while<>0 a,i,I)) . (inspos ((card I) + 3)) by A12, GRFUNC_1:8
.= halt SCMPDS by A11, SCMPDS_6:25 ;
then A14: CurInstr (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),2) = halt SCMPDS by A13;

now

let k be Element of NAT ; :: thesis: IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),b₁) in dom (stop (while<>0 a,i,I))
( k = 0 or 0 < k ) by NAT_1:3;
then A15: ( k = 0 or 0 + 1 <= k ) by INT_1:20;

per cases ( k = 0 or k = 1 or 1 < k ) by A15, XXREAL_0:1;

suppose k = 0 ; :: thesis: IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),b₁) in dom (stop (while<>0 a,i,I))

then Computation (s +* (Initialized (stop (while<>0 a,i,I)))),k = s +* (Initialized (stop (while<>0 a,i,I))) by AMI_1:13;
hence IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),k) in dom (stop (while<>0 a,i,I)) by A4, SCMPDS_4:75; :: thesis: verum

end;

suppose k = 1 ; :: thesis: IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),b₁) in dom (stop (while<>0 a,i,I))

hence IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),k) in dom (stop (while<>0 a,i,I)) by A9, A6, SCMPDS_6:18; :: thesis: verum

end;

suppose 1 < k ; :: thesis: IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),b₁) in dom (stop (while<>0 a,i,I))

then 1 + 1 <= k by INT_1:20;
hence IC (Computation (s +* (Initialized (stop (while<>0 a,i,I)))),k) in dom (stop (while<>0 a,i,I)) by A12, A13, A14, AMI_1:52; :: thesis: verum

end;

end;

end;

hence while<>0 a,i,I is_closed_on s by SCMPDS_6:def 2; :: thesis: while<>0 a,i,I is_halting_on s
s +* (Initialized (stop (while<>0 a,i,I))) is halting by A14, AMI_1:def 20;
hence while<>0 a,i,I is_halting_on s by SCMPDS_6:def 3; :: thesis: verum