fact: Definition is_univalent_in_fibers_from_univalent_disp {C} (D : disp_cat C) : is_univalent_disp D -> is_univalent_in_fibers D.
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