let s be State of SCMPDS; for I, J being halt-free parahalting shiftable Program of SCMPDS
for a being Int_position
for k1 being Integer holds IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2
let I, J be halt-free parahalting shiftable Program of SCMPDS; for a being Int_position
for k1 being Integer holds IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2
let a be Int_position ; for k1 being Integer holds IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2
let k1 be Integer; IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2
set IF = if<0 (a,k1,I,J);
A1:
( I is_closed_on s & I is_halting_on s )
by Th34, Th35;
A2:
( J is_closed_on s & J is_halting_on s )
by Th34, Th35;
per cases
( s . (DataLoc ((s . a),k1)) < 0 or s . (DataLoc ((s . a),k1)) >= 0 )
;
suppose
s . (DataLoc ((s . a),k1)) < 0
;
IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2then
IExec (
(if<0 (a,k1,I,J)),
s)
= (IExec (I,s)) +* (Start-At ((((card I) + (card J)) + 2),SCMPDS))
by A1, Th114;
hence
IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2
by FUNCT_4:121;
verum end; suppose
s . (DataLoc ((s . a),k1)) >= 0
;
IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2then
IExec (
(if<0 (a,k1,I,J)),
s)
= (IExec (J,s)) +* (Start-At ((((card I) + (card J)) + 2),SCMPDS))
by A2, Th115;
hence
IC (IExec ((if<0 (a,k1,I,J)),s)) = ((card I) + (card J)) + 2
by FUNCT_4:121;
verum end; end;