Definition postcomp_with {C : precategory_data} {b c : C} (h : b --> c) {a : C} (f : a --> b) : a --> c := f · h.
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.