proposition: Lemma isabgrop_ringofendabgr_op1 {G : abgr} : isabgrop (@ringofendabgr_op1 G).
proof: Proof. exact (make_isabgrop isgrop_ringofendabgr_op1 iscomm_ringofendabgr_op1). Defined.
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids