proposition: Lemma size_exp_close_exp_wrt_exp_rec : forall e1 x1 n1, size_exp (close_exp_wrt_exp_rec n1 x1 e1) = size_exp e1.
proof: Proof. pose proof size_exp_close_exp_wrt_exp_rec_mutual as H; intuition eauto. Qed.
imports: Coq.Logic.FunctionalExtensionality Coq.Program.Equality Metalib.Metatheory Metalib.LibLNgen Stlc