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