proposition: Lemma isinv_setofendabgr_inv {G : abgr} : isinv (@ringofendabgr_op1 G) (unel_is (@ismonoidop_ringofendabgr_op1 G)) setofendabgr_inv.
proof: Proof. exact (make_isinv islinv_setofendabgr_inv isrinv_setofendabgr_inv). Defined.
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids