Definition make_pair_diagram {C : category} (a b : C) (f g : a --> b) : diagram pair_graph C. Proof. apply(make_parallell_diagram (unit ⨿ unit) a b). exact(sumofmaps (λ _, f) (λ _, g)). Defined.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Limits.Graphs.Colimits. Require Import UniMath.Combinatorics.StandardFiniteSets. Require Import UniMath.Combinatorics.FiniteSets.