proposition: Lemma ltr_eXz2l x (x1 : 1 < x) : {mono exprz x : x y / x < y}.
proof: Proof. exact: (leW_mono (ler_eXz2l _)). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)