Definition dirprod_disp_cat_ob_mor {C : precategory_ob_mor} (D1 D2 : disp_cat_ob_mor C) : disp_cat_ob_mor C. Proof. exists (λ c, D1 c × D2 c). intros x y xx yy f. exact (pr1 xx -->[f] pr1 yy × pr2 xx -->[f] pr2 yy). Defined.
Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.DisplayedCats.Core. Require Import UniMath.CategoryTheory.DisplayedCats.Functors. Require Import UniMath.CategoryTheory.DisplayedCats.Isos. Require Import UniMath.CategoryTheory.DisplayedCats.Univalence.