proposition: Lemma omorph_le : {mono f : x y / x <= y}.
proof: Proof. exact: omorph_le_subproof. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)