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