proposition: Lemma derivable_expR x : derivable expR x 1.
proof: Proof. by apply: ex_derive; apply: is_derive_exp. 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