proposition: Lemma continuous_expR : continuous (@expR R).
proof: Proof. by move=> x; exact/differentiable_continuous/derivable1_diffP/derivable_expR. 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