Definition three_colims {C : category} (CC : Colims C) : Colims (three C). Proof. intros g d. use tpair. - exists (three_colimit d CC). exact (three_cocone d CC). - exact (three_isColimCocone d CC). Defined.
Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Prelude. Require Import UniMath.CategoryTheory.PrecategoryBinProduct. Require Import UniMath.CategoryTheory.DisplayedCats.Core. Require Import UniMath.CategoryTheory.DisplayedCats.Total. Require Import UniMath.CategoryTheory.Limits.Graphs.Colimits. Require Import UniMath.CategoryTheory.DisplayedCats.Examples.Arrow.