proposition: Lemma RcS_idRen {Γ Γ'} (σ : Sub Γ Γ') : RcS idRen σ = σ.
proof: Proof. induction σ; simp RcS; simpl; simp RcS; auto. now rewrite IHσ. Qed.
imports: Coq.Lists.List Category.Lib Category.Instance.Lambda.Exp Category.Instance.Lambda.Value Category.Instance.Lambda.Ren Equations(Equations)