Definition Under_mor_mor {X Y : Under_ob} (M : Under_mor X Y) : C⟦Under_ob_cod X, Under_ob_cod Y⟧ := pr1 M.
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.