fact: Definition setofendabgr_to_unel {G : abgr} (f : setofendabgr G) : pr1setofendabgr f 0 = 0 := pr2 (pr2setofendabgr f).
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids