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Let E be an arbitrary set, a σ-algebra of subsets of the Borel sets of F . We write A × B for the product of the sets A and B , and for the product σ-algebra of and (i.e. the σ-algebra generated by the rectangles A × B with A ∈ and B ∈ ).
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Erhan Çınlar (1969) studied this question.
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