proposition: Proposition isaset_square_double_bicat {w x y z : B} (h₁ : w --> x) (h₂ : y --> z) (v₁ : w -|-> y) (v₂ : x -|-> z) : isaset (square_double_bicat h₁ h₂ v₁ v₂).
proof: Proof. exact (pr2 (pr222 B) _ _ _ _ h₁ h₂ v₁ v₂). Defined.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.Bicategories.Core.Bicat