proposition: Lemma validUnPtE v2 v1 k f : valid (f \+ pts k v1) = valid (f \+ pts k v2).
proof: Proof. by rewrite !validUnPt. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)