proposition: Lemma isdistr_setofendabgr_op {G : abgr} : isdistr (@ringofendabgr_op1 G) (@ringofendabgr_op2 G).
proof: Proof. exact (make_dirprod isldistr_setofendabgr_op isrdistr_setofendabgr_op). Defined.
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids