∀ {α : Type u_1} {β : Type u_2} {m : MeasurableSpace α} {μ : MeasureTheory.Measure α} [inst : NormedAddCommGroup β]
  {f g : α → β},
  MeasureTheory.Integrable f μ → MeasureTheory.Integrable (fun x => g x + f x) μ = MeasureTheory.Integrable g μ