∀ {X : Type u_1} {mX : MeasurableSpace X} {μ : MeasureTheory.Measure X} {ι : Type u_5} {t : Finset ι} {s : ι → Set X},
  (∀ i ∈ t, MeasurableSet (s i)) →
    autoParam (∀ i ∈ t, μ (s i) ≠ ⊤) MeasureTheory.measureReal_biUnion_eq_sum_powerset._auto_1 →
      μ.real (⋃ i ∈ t, s i) = ∑ u ∈ t.powerset with u.Nonempty, (-1) ^ (u.card + 1) * μ.real (⋂ i ∈ u, s i)