Definition graph_mor_eq {G H : pregraph} (p q : graph_mor G H) (e₀ : ∏ x : vertex G, onvertex p x = onvertex q x) (e₁ : ∏ x y (f : edge G x y), UniMath.
Require Import UniMath.Foundations.PartB. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.Combinatorics.Graph.