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