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