If `f` is measure preserving from `Measure.pi m` to `ν`, the product of the cells `C j` is conull, and the trace on it of `f ⁻¹' E` is the finite union over `τ ∈ T` of products of the measurable facto

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If `f` is measure preserving from `Measure.pi m` to `ν`, the product of the cells `C j` is conull, and the trace on it of `f ⁻¹' E` is the finite union over `τ ∈ T` of products of the measurable facto · Prove2Me