proposition: Lemma domUnPtE2 k v1 v2 f : dom (f \+ pts k v1) = dom (f \+ pts k v2).
proof: Proof. by rewrite !(joinC f); apply: domPtUnE2. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)