proposition: Proposition isaprop_left_beck_chevalley {w x y z : C} (f : x --> w) (g : y --> w) (h : z --> y) (k : z --> x) (p : k · f = h · g) (L₁ : dependent_sum f) (L₂ : dependent_sum h) : isaprop (left_beck_chevalley f g h k p L₁ L₂).
proof: Proof. use impred ; intro. apply isaprop_is_z_isomorphism. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.Adjunctions.Core UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.Univalence UniMath.CategoryTheory.DisplayedCats.Functors UniMath.CategoryTheory.DisplayedCats.Fibrations UniMath.CategoryTheory.DisplayedCats.Fiber UniMath.CategoryTheory.whiskering UniMath.CategoryTheory.Limits.Pullbacks