Abstract
Let WF ⊆ Tr be the set of well-founded trees on ℕ. Then WF is П 11 -complete (see 32.B). Also, by 27.3, the set WF *2 = Tr2 \ IF *2 of all pruned trees on 2 which have no infinite branch in N is П 11 is -complete. Recall also from 32.B that the set WO of wellorderings on ℕ is П 11 -complete.
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© 1995 Springer-Verlag New York, Inc.
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Kechris, A.S. (1995). Examples. 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_33
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DOI: https://doi.org/10.1007/978-1-4612-4190-4_33
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