proposition: Lemma fun_ext_nondep_4 : forall A1 A2 A3 A4 B (f g : A1 -> A2 -> A3 -> A4 -> B), (forall x1 x2 x3 x4, f x1 x2 x3 x4 = g x1 x2 x3 x4) -> f = g.
proof: Proof. Proof using. intros. apply~ fun_ext_4. Qed.
imports: TLC(LibTactics LibAxioms)