Lemma isunital_ringofendabgr_op2 {G : abgr} : isunital (@ringofendabgr_op2 G). Proof. exact (make_isunital setofendabgr_un1 isunit_setofendabgr_un1). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.