proposition: Lemma ln1 : ln 1 = 0.
proof: Proof. by apply/expR_inj; rewrite lnK// ?expR0// qualifE/=. 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