∀ {α : Type u_1} {E : Type u_2} {F : Type u_3} [inst : NormedAddCommGroup E] [inst_1 : NormedSpace ℝ E]
  [inst_2 : NormedAddCommGroup F] [inst_3 : NormedSpace ℝ F] {m : MeasurableSpace α} {μ : MeasureTheory.Measure α}
  [inst_4 : CompleteSpace F] {T : Set α → E →L[ℝ] F} {C : ℝ} (hT : MeasureTheory.DominatedFinMeasAdditive μ T C),
  ‖MeasureTheory.L1.setToL1 hT‖ ≤ ‖MeasureTheory.L1.SimpleFunc.setToL1SCLM α E μ hT‖