∀ {X : Type u_1} {E : Type u_6} [inst : MeasurableSpace X] [inst_1 : TopologicalSpace X] [inst_2 : NormedAddCommGroup E]
  {μ : MeasureTheory.Measure X} {s : Set X} {f g : X → E},
  MeasureTheory.LocallyIntegrableOn f s μ →
    MeasureTheory.LocallyIntegrableOn g s μ → MeasureTheory.LocallyIntegrableOn (f - g) s μ