∀ {α : Type u_1} [inst : MeasurableSpace α] (s : MeasureTheory.SignedMeasure α) (i : Set α) (n : ℕ),
  MeasureTheory.SignedMeasure.restrictNonposSeq✝ s i n.succ =
    MeasureTheory.SignedMeasure.someExistsOneDivLT✝ s
      (i \
        ⋃ k,
          ⋃ (H : k ≤ n),
            have this := ⋯;
            MeasureTheory.SignedMeasure.restrictNonposSeq✝¹ s i k)