Definition from_stable_mor : apbp --> PB y (BC a b) x (cod_fib_coproduct_ob_mor ag₁ bg₂ (BC a b)) f. Proof. use PullbackArrow. - exact (PullbackPr1 Hpb). - exact (PullbackPr2 Hpb). - abstract (apply (PullbackSqrCommutes Hpb)). Defined.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Prelude. Require Import UniMath.CategoryTheory.Monics. Require Import UniMath.CategoryTheory.DisplayedCats.Codomain. Require Import UniMath.CategoryTheory.DisplayedCats.Codomain.FiberCod. Require Import UniMath.CategoryTheory.DisplayedCats.Codomain.CodColimits. Require Import UniMath.CategoryTheory.Limits.Initial. Require Import UniMath.CategoryTheory.Limits.BinCoproducts. Require Import UniMath.CategoryTheory.Limits.Pullbacks. Require Import UniMath.CategoryTheory.Limits.Preservation. Section FromStable. End FromStable.