for R being Ring
for a, b being Data-Location of R
for s being State of (SCM R) holds
( (Exec ((a := b),s)) . (IC ) = (IC s) + 1 & (Exec ((a := b),s)) . a = s . b & ( for c being Data-Location of R st c <> a holds
(Exec ((a := b),s)) . c = s . c ) )