for P being Instruction-Sequence of SCMPDS
for s being 0 -started State of SCMPDS
for sp, cv, result, pp, pD being Nat
for f being FinSequence of NAT st s . (intpos sp) > sp & cv < result & (s . (intpos sp)) + result < pp & pp < pD & pD < s . (intpos pD) & len f = s . (DataLoc ((s . (intpos sp)),cv)) & ( for k being Nat st k < len f holds
f . (k + 1) = s . (DataLoc ((s . (intpos pD)),k)) ) holds
(IExec ((sum (sp,cv,result,pp,pD)),P,s)) . (DataLoc ((s . (intpos sp)),result)) = Sum f