proposition: Proposition isaprop_hor_id_laws {C : category} {D : twosided_disp_cat C C} (I : hor_id_data D) : isaprop (hor_id_laws I).
proof: Proof. use isapropdirprod ; (repeat (use impred ; intro)) ; apply isaset_disp_mor. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Isos