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