proposition: Lemma leW_nmono : {mono f : x y /~ x <= y} -> {mono f : x y /~ x < y}.
proof: Proof. by apply: anti_mono=> // x y; rewrite eq_sym. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)