proposition: Lemma typing_g Gamma: Gamma ⊢(2) g : alpha → alpha → alpha.
proof: Proof. econstructor; cbn; auto. Qed.
imports: RelationClasses Morphisms List Lia Init.Nat Setoid Undecidability.HOU(calculus.calculus second_order.diophantine_equations systemunification nth_order_unification)