∀ {α : Type u_1} {m : MeasurableSpace α} (s : MeasureTheory.SignedMeasure α) (i : Set α),
  MeasureTheory.VectorMeasure.restrict 0 i ≤ MeasureTheory.VectorMeasure.restrict s i →
    ∀ (j : Set α), MeasurableSet j → 0 ≤ ↑(MeasureTheory.VectorMeasure.restrict s i) j