∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  {F G H : CategoryTheory.Functor D C} [inst_2 : CategoryTheory.Limits.HasPullbacks C] (f : F ⟶ H) (g : G ⟶ H) (d : D),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.pullbackObjIso f g d).inv
      ((CategoryTheory.Limits.pullback.snd f g).app d) =
    CategoryTheory.Limits.pullback.snd (f.app d) (g.app d)