Definition iso_is_iso {C : precategory_data} {a b : C} (f : iso a b) : is_iso f := pr2 f.
Require Import UniMath.Foundations.PartA. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.CategoryTheory.Core.Categories.