fact: Definition twosided_disp_cat_id {C₁ C₂ : precategory_data} (D : twosided_disp_cat_ob_mor C₁ C₂) : UU := ∏ (x : C₁) (y : C₂) (xy : D x y), xy -->[ identity x ][ identity y ] xy.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.PrecategoryBinProduct