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