proposition: Lemma lteif_pdivlMl C z x y : 0 < z -> x < z^-1 * y ?<= if C = (z * x < y ?<= if C).
proof: Proof. by case: C => ? /=; rewrite lter_pdivlMl. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)