fact: Definition is_univalent_in_fibers {C} (D : disp_cat C) : UU := ∏ x (xx xx' : D x), isweq (fun e : xx = xx' => idtoiso_fiber_disp e).
imports: UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.Isos