Definition Under_precategories_mor_ob {c c' : C} (h : C⟦c, c'⟧) : c' / C → c / C. Proof. intro af. exists (pr1 af). exact (h · pr2 af). Defined.
Require Import UniMath.Foundations.PartD. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Functors.