proposition: Proposition transportf_square_id_h_square_eq' {C : double_cat} {x y : C} {v v' v'' : x -->v y} (p : v = v') (q : v = v'') : transportf_square p q (id_h_square v) = transportf_square (idpath _) (!p @ q) (id_h_square v').
proof: Proof. induction p, q ; cbn. apply idpath. Qed.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence UniMath.Bicategories.Core.Bicat UniMath.Bicategories.DoubleCategories.Core.DoubleCats UniMath.Bicategories.DoubleCategories.Core.UnivalentDoubleCats