fact: Parameter vrf_frame : forall A e i j (Q : post A), vrf i e (fun y m => valid (m \+ j) -> Q y (m \+ j)) -> vrf (i \+ j) e Q.
imports: mathcomp(ssreflect ssrbool ssrfun ssrnat eqtype seq) pcm(options axioms pred prelude) pcm(pcm unionmap heap) htt(domain)