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