{B : Type u₁} →
  [inst : CategoryTheory.Bicategory B] →
    {C : Type u₂} →
      [inst_1 : CategoryTheory.Bicategory C] →
        {F G : CategoryTheory.LaxFunctor B C} →
          (self : CategoryTheory.Lax.StrongTrans F G) →
            {a b : B} →
              (f : a ⟶ b) →
                CategoryTheory.CategoryStruct.comp (self.app a) (G.map f) ≅
                  CategoryTheory.CategoryStruct.comp (F.map f) (self.app b)