Definition is_left_extension {h : y --> z} (τ : f ==> g · h) : UU := ∏ (k : y --> z), isweq (λ (θ : h ==> k), τ • (g ◃ θ)).
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Prelude. Require Import UniMath.Bicategories.Core.Bicat. Import Bicat.Notations. Require Import UniMath.Bicategories.Core.Examples.OpMorBicat. Require Import UniMath.Bicategories.Core.Examples.OpCellBicat.