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
set s = the State of (SCM R);
(Exec ((a := b), the State of (SCM R))) . (IC ) = succ (IC the State of (SCM R)) by Th13;
hence not a := b is halting by Th20; :: thesis: verum