fact: Definition square_verity_double_from_ver_inv2cell {x y : B} {f g : x --> y} (τ : invertible_2cell (C := ver_bicat_of_verity_double_bicat square_verity_double_bicat) f g) : invertible_2cell (C := B) f g.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.BicategoryLaws UniMath.Bicategories.Core.Unitors UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Morphisms.Adjunctions UniMath.Bicategories.Core.Univalence UniMath.Bicategories.Core.EquivToAdjequiv UniMath.Bicategories.Core.AdjointUnique UniMath.Bicategories.DoubleCategories.DoubleBicat.Core