Definition interval_graph : graph. Proof. use make_graph. - exact bool. - intros a b. induction a; induction b. + exact empty. + exact unit. + exact empty. + exact empty. 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.