proposition: Proposition isaset_square {C : double_cat} {x₁ x₂ y₁ y₂ : C} (v₁ : x₁ -->v y₁) (v₂ : x₂ -->v y₂) (h₁ : x₁ -->h x₂) (h₂ : y₁ -->h y₂) : isaset (square v₁ v₂ h₁ h₂).
proof: Proof. apply isaset_disp_mor. 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