set i = (a,k1) >=0_goto k2;
A3: InsCode (halt SCMPDS) = 0 by RECDEF_2:def 1;
InsCode ((a,k1) >=0_goto k2) = 6 by SCMPDS_2:18;
then (a,k1) >=0_goto k2 <> halt SCMPDS by A3;
hence (a,k1) >=0_goto k2 is No-StopCode by COMPOS_0:def 12; :: thesis: verum