proposition: Lemma Derivative_I_n_imp_inc : forall n F F', Derivative_I_n Hab' n F F' -> included I (Dom F).
proof: Proof. intros; apply Diffble_I_n_imp_inc with n. apply deriv_n_imp_Diffble_I_n with F'; assumption. Qed.
imports: CoRN.ftc.Differentiability