Abstract
For any metrizable spare X recall the definition of the Borel hierarchy \(\Sigma _\xi ^0\left( X \right),II_\xi ^0\left( X \right),\Delta _\xi ^0\left( X \right) \)in Section 11.B. Without repeating it explicitly, in this notation we always assume that 1 ≤ ξ < ω1.
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© 1995 Springer-Verlag New York, Inc.
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Kechris, A.S. (1995). The Borel Hierarchy. In: Classical Descriptive Set Theory. Graduate Texts in Mathematics, vol 156. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4190-4_22
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DOI: https://doi.org/10.1007/978-1-4612-4190-4_22
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