let R be good Ring; :: thesis: for a, b being Data-Location of R holds not a := b is halting
let a, b be Data-Location of R; :: thesis: not a := b is halting
consider s being State of (SCM R);
(Exec (a := b),s) . (IC (SCM R)) = Next by Th13;
hence not a := b is halting by Th20; :: thesis: verum