proposition: Lemma idtoiso_fiber_disp {C} {D : disp_cat C} {x : C} {xx xx' : D x} (ee : xx = xx') : z_iso_disp (identity_z_iso x) xx xx'.
proof: Proof. exact (idtoiso_disp (idpath _) ee). Defined.
imports: UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.DisplayedCats.Core