Lemma isassoc_ringofendabgr_op2 {G : abgr} : isassoc (@ringofendabgr_op2 G). Proof. intros f g h. use total2_paths_f. - apply funcomp_assoc. - apply isapropismonoidfun. Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.