proposition: Lemma ltr_pMz2l x (hx : 0 < x) : {mono *~%R x : x y / x < y}.
proof: Proof. exact: leW_mono (ler_pMz2l _). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)