fact: Definition square_to_vertical_cell (HB : vertically_saturated B) {x y : B} {v₁ v₂ : x -|-> y} (s : square_double_bicat (id_h x) (id_h y) v₁ v₂) : v₁ =|=> v₂ := invmap (vertical_cell_to_square_weq HB v₁ v₂) s.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Isos UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence UniMath.CategoryTheory.TwoSidedDisplayedCats.Discrete UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Unitors UniMath.Bicategories.DoubleCategories.DoubleBicat.VerityDoubleBicat UniMath.Bicategories.DoubleCategories.DoubleBicat.DerivedLaws