Definition gr_iso_equiv_weq (X Y : ob gr_category) : weq (z_iso X Y) (monoidiso (X : gr) (Y : gr)). Proof. use make_weq. - exact (gr_iso_equiv X Y). - exact (gr_iso_equiv_is_equiv X Y). Defined.
Require Import UniMath.Foundations.PartD. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.Foundations.UnivalenceAxiom. Require Import UniMath.Algebra.BinaryOperations. Require Import UniMath.Algebra.Monoids. Require Import UniMath.Algebra.Groups. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.Core.Functors.