proposition: Lemma ltr_ln : {in Num.pos &, {mono ln : x y / x < y}}.
proof: Proof. by move=> x y x_gt0 y_gt0; rewrite -ltr_expR !lnK. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(boolp classical_sets functions) mathcomp(mathcomp_extra) reals ereal signed topology normedtype landau sequences derive realfun itv convex