∀ {α : Type u_1} {E : Type u_2} [inst : NormedAddCommGroup E] {m : MeasurableSpace α} {μ : MeasureTheory.Measure α}
  [inst_1 : NormedSpace ℝ E] [inst_2 : CompleteSpace E] (f : ↥(MeasureTheory.Lp E 1 μ)),
  MeasureTheory.L1.integral f = (MeasureTheory.L1.setToL1 ⋯) f