proposition: Lemma Acc_clos_trans' {X : Type} (R : X -> X -> Prop) x : Acc (clos_trans _ R) x -> Acc R x.
proof: Proof. by elim; eauto using Acc, clos_trans. Qed.
imports: Undecidability.IntersectionTypes.CD Undecidability.IntersectionTypes.Util.CD_facts Undecidability.IntersectionTypes.Util.CD_fundamental Undecidability.LambdaCalculus.Util.term_facts Relations List Wellfounded.Transitive_Closure ssreflect