fact: Definition hor_id {C : category} (D : twosided_disp_cat C C) : UU := ∑ (I : hor_id_data D), hor_id_laws I.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Isos