Lemma isaset_section_nat_trans_disp (F F': section_disp) : isaset (section_nat_trans_disp F F'). Proof. apply (isofhleveltotal2 2). - apply impred. intro t. apply homsets_disp. - intro x. apply isasetaprop. apply isaprop_section_nat_trans_disp_axioms. Qed.
Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.DisplayedCats.Core.