fact: Definition is_left_lifting {h : z --> y} (τ : f ==> h · g) : UU := ∏ (k : z --> y), isweq (λ (θ : h ==> k), τ • (θ ▹ g)).
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