∀ (C : Type u_2) [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Limits.HasColimits C]
  {X Y : TopCat} (f : X ⟶ Y) (F : TopCat.Presheaf C Y) (x : ↑X),
  CategoryTheory.CategoryStruct.comp (TopCat.Presheaf.stalkPullbackHom C f F x)
      (TopCat.Presheaf.stalkPullbackInv C f F x) =
    CategoryTheory.CategoryStruct.id (F.stalk ((CategoryTheory.ConcreteCategory.hom f) x))