proposition: Lemma cmUU i : U_(i)%M i = 1%N.
proof: Proof. by rewrite cmU eqxx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path choice finset fintype finfun) mathcomp(tuple bigop ssralg ssrint ssrnum) xfinmap