proposition: Proposition isaprop_is_absolute_left_extension {B : bicat} {x y z : B} {f : x --> z} {g : x --> y} {h : y --> z} {τ : f ==> g · h} (Hτ : is_left_extension f g τ) : isaprop (is_absolute_left_extension Hτ).
proof: Proof. do 2 (use impred ; intro). apply isaprop_preserves_is_left_extension. Qed.
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