proposition: Proposition transportbf_square {C : double_cat} {x₁ x₂ y₁ y₂ : C} {v₁ v₁' : x₁ -->v y₁} {v₂ v₂' : x₂ -->v y₂} {h₁ : x₁ -->h x₂} {h₂ : y₁ -->h y₂} (p : v₁ = v₁') (q : v₂ = v₂') (s : square v₁ v₂ h₁ h₂) : transportb_square p q (transportf_square p q s) = s.
proof: Proof. induction p, q. apply idpath. Qed.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Isos UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence UniMath.Bicategories.Core.Examples.BicatOfUnivCats UniMath.Bicategories.DoubleCategories.Basics.DoubleCategoryBasics