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