let R be good Ring; :: thesis: for r being Element of R
for a being Data-Location of R holds not a := r is halting
let r be Element of R; :: thesis: for a being Data-Location of R holds not a := r is halting
let a be Data-Location of R; :: thesis: not a := r is halting
consider s being State of (SCM R);
(Exec (a := r),s) . (IC (SCM R)) = Next by Th19;
hence not a := r is halting by Th20; :: thesis: verum