Definition span_graph : graph. Proof. use make_graph. - exact three. - use three_rec. + apply three_rec. * exact empty. * exact unit. * exact unit. + exact(λ _, empty). + exact(λ _, 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.