proposition: Lemma domeqPt k v1 v2 : dom_eq (pts k v1 : U) (pts k v2).
proof: Proof. by apply/domeqP; rewrite !validPt; split=>// x; rewrite !domPt. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)