proposition: Lemma Diffble_I_n_imp_diffble : forall n : nat, 0 < n -> forall F : PartIR, Diffble_I_n Hab' n F -> Diffble_I Hab' F.
proof: Proof. intros n H F. rewrite <- (Nat.lt_succ_pred 0 n);auto. simpl. intro H0. simpl in H0. inversion_clear H0; assumption. Qed.
imports: CoRN.ftc.Differentiability