∀ {Ω : Type u_1} {ι : Type u_2} {m : ι → MeasurableSpace Ω} {x : MeasurableSpace Ω} {μ : MeasureTheory.Measure Ω}
  {S : Finset ι} {s : ι → Set Ω},
  ProbabilityTheory.iIndep m μ → (∀ i ∈ S, MeasurableSet (s i)) → μ (⋂ i ∈ S, s i) = ∏ i ∈ S, μ (s i)