Lemma islunit_setofendabgr_un0 {G : abgr} : islunit (@ringofendabgr_op1 G) setofendabgr_un0. Proof. intro f. use total2_paths_f. - apply funextfun. intro x. apply (lunax G (pr1setofendabgr f x)). - apply isapropismonoidfun. Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.RigsAndRings. Require Import UniMath.Algebra.Groups. Require Import UniMath.Algebra.Monoids.