∀ {α : Type u_1} {m : Set α → ENNReal} {m_empty : m ∅ = 0} (s : Set α),
  Monotone m →
    (MeasureTheory.OuterMeasure.restrict s) (MeasureTheory.OuterMeasure.ofFunction m m_empty) =
      MeasureTheory.OuterMeasure.ofFunction (fun t => m (t ∩ s)) ⋯