Abstract
For each n ≥ 1 we define the projective (or Lusin) classes Δ 1 n , П 1 n , △ 1 n of sets in Polish spaces as follows: We have already defined the Δ 1 1 (= analytic), П 1 1 (= co-analytic) sets. Then we let, in general,
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© 1995 Springer-Verlag New York, Inc.
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Kechris, A.S. (1995). The Projective 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_37
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DOI: https://doi.org/10.1007/978-1-4612-4190-4_37
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