Lemma isgrop_ringofendabgr_op1 {G : abgr} : isgrop (@ringofendabgr_op1 G). Proof. exact (make_isgrop ismonoidop_ringofendabgr_op1 invstruct_setofendabgr_inv). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.