proposition: Lemma ln_inj : {in Num.pos &, injective ln}.
proof: Proof. by move=> x y /lnK {2}<- /lnK {2}<- ->. 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