Lemma isunit_setofendabgr_un1 {G : abgr} : isunit (@ringofendabgr_op2 G) setofendabgr_un1. Proof. exact (make_isunit islunit_setofendabgr_un1 isrunit_setofendabgr_un1). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.