∀ {C : Type u₁} {inst : CategoryTheory.Category.{v₁, u₁} C} {D : Type u₂} {inst_1 : CategoryTheory.Category.{v₂, u₂} D}
  {S : CategoryTheory.Functor Cᵒᵖ CommRingCat} {F : CategoryTheory.Functor C D}
  {R : CategoryTheory.Functor Dᵒᵖ CommRingCat}
  {M : PresheafOfModules (R.comp (CategoryTheory.forget₂ CommRingCat RingCat))} {φ : S ⟶ F.op.comp R}
  {x y : M.Derivation φ},
  @PresheafOfModules.Derivation.d C inst D inst_1 S F R M φ x =
      @PresheafOfModules.Derivation.d C inst D inst_1 S F R M φ y →
    x = y