proposition: Lemma degree_exp_wrt_exp_O : forall n1 e1, degree_exp_wrt_exp O e1 -> degree_exp_wrt_exp n1 e1.
proof: Proof. induction n1; default_simp. Qed.
imports: Coq.Logic.FunctionalExtensionality Coq.Program.Equality Metalib.Metatheory Metalib.LibLNgen Stlc