proposition: Lemma zring_one : zring 1 [=] [1].
proof: Proof. simpl in |- *. unfold pring in |- *. algebra. Qed.
imports: CoRN.tactics.CornTac CoRN.algebra.CSums CoRN.algebra.CAbMonoids Coq.Sorting.Permutation CoRN.util.SetoidPermutation Coq.Setoids.Setoid Coq.Classes.Morphisms Coq(Lia)