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The purpose of this book is to lay out certain aspects of descriptive set theory. After initially establishing notation and generalities we proceed to the following topics: partitions, semirings, rings, σ-rings, δ-rings, products and sums, extension and generation. Extensive references and historical comments are included at the end of each section, as are further examples in the form of exercises and problems.
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Garth Warner (2024) studied this question.
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