proposition: Lemma iscomm_ringofendabgr_op1 {G : abgr} : iscomm (@ringofendabgr_op1 G).
proof: Proof. intros f g. use total2_paths_f. - apply funextfun. intro x. apply (commax G). - apply (isapropismonoidfun). Defined.
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids