proposition: Lemma domeq2_unit : dom_eq2 (Unit : U1) (Unit : U2).
proof: Proof. by rewrite /dom_eq2 !valid_unit !dom0. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)