proposition: Lemma one_plus_one : forall R : CRing, [1][+][1] [=] (Two:R).
proof: Proof. simpl 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)