let R be good Ring; :: thesis: for a, b being Data-Location of R holds not SubFrom a,b is halting
let a, b be Data-Location of R; :: thesis: not SubFrom a,b is halting
consider s being State of (SCM R);
(Exec (SubFrom a,b),s) . (IC (SCM R)) = succ (IC s) by Th15;
hence not SubFrom a,b is halting by Th20; :: thesis: verum