proposition: Lemma ummono0 : um_mono Unit.
proof: Proof. by apply/ummonoP=>???? /In0. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)