Definition inv_from_iso {C : precategory_data} {a b : C} (f : iso a b) : b --> a := invmap (make_weq (precomp_with f) (pr2 f a)) (identity _ ).
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.