Lemma isunit_setofendabgr_un0 {G : abgr} : isunit (@ringofendabgr_op1 G) setofendabgr_un0. Proof. exact (make_isunit islunit_setofendabgr_un0 isrunit_setofendabgr_un0). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.