proposition: Lemma ltrW_lteif C x y : x < y -> x < y ?<= if C.
proof: Proof. by case: C => // /ltW. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)