proposition: Lemma ler_wpMn2l x : 0 <= x -> {homo (@GRing.natmul R x) : m n / (m <= n)%N >-> m <= n}.
proof: Proof. by move=> xge0 m n /subnK <-; rewrite mulrnDr ler_wpDl ?mulrn_wge0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)