∀ {δ : Type u_1} {X : δ → Type u_3} [inst : (i : δ) → MeasurableSpace (X i)] {μ : (i : δ) → MeasureTheory.Measure (X i)}
  [inst_1 : DecidableEq δ] [∀ (i : δ), MeasureTheory.SigmaFinite (μ i)] [inst_3 : Fintype δ]
  {f : ((i : δ) → X i) → ENNReal},
  ∫⋯∫⁻_Finset.univ, f ∂μ = fun x => ∫⁻ (x : (i : δ) → X i), f x ∂MeasureTheory.Measure.pi μ