fact: Definition double_cat_to_verity_double_bicat_are_companions {C : double_cat} {x y : C} (h : x -->h y) (v : x -->v y) : double_cat_are_companions h v ≃ are_companions (B := double_cat_to_verity_double_bicat C) v h.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Examples.DiscreteBicat UniMath.Bicategories.DoubleCategories.DoubleBicat.Core UniMath.Bicategories.DoubleCategories.Basics.DoubleCategoryBasics UniMath.Bicategories.DoubleCategories.Core.DoubleCats UniMath.Bicategories.DoubleCategories.DerivedLaws.TransportLaws UniMath.Bicategories.DoubleCategories.Core.UnivalentDoubleCats UniMath.Bicategories.DoubleCategories.Core.CompanionsAndConjoints UniMath.Bicategories.DoubleCategories.Underlying.HorizontalBicategory