proposition: Lemma assocs_dom f : dom f = map fst (assocs f).
proof: Proof. by rewrite !umEX; case: (UMC.from f). Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)