Lemma isunital_ringofendabgr_op1 {G : abgr} : isunital (@ringofendabgr_op1 G). Proof. exact (make_isunital setofendabgr_un0 isunit_setofendabgr_un0). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.