`BookProof.ChapterSolovayCoordinates.infinitePi_map_sumPiEquivProdPi` {ι ι' : Type*} [Fintype ι] {X : ι ⊕ ι' → Type*} [∀ i, MeasurableSpace (X i)] (mu : ∀ i, Measure (X i)) [∀ i, I

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`BookProof.ChapterSolovayCoordinates.infinitePi_map_sumPiEquivProdPi` {ι ι' : Type*} [Fintype ι] {X : ι ⊕ ι' → Type*} [∀ i, MeasurableSpace (X i)] (mu : ∀ i, Measure (X i)) [∀ i, I · Prove2Me