proposition: Lemma domeq2_dom_mapR x : dom_eq2 x (dom_map x).
proof: Proof. by apply: domeq2_sym; apply: domeq2_dom_mapL. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)