fact: Definition has_dependent_sums : UU := ∑ (L : ∏ (x y : C) (f : x --> y), dependent_sum f), ∏ (w x y z : C) (f : x --> w) (g : y --> w) (h : z --> y) (k : z --> x) (p : k · f = h · g) (H : isPullback p), left_beck_chevalley f g h k p (L _ _ f) (L _ _ h).
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