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3
Definition of HYP in $L_{\omega_1^{CK}}[a]$?
3
To find an element of a $\Pi^1_1$ set
3
Vitali Sets vs Bernstein Sets…
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Probability that a Turing machine will nontrivially reduce a real
10
Partitioning $\mathbb{R}$ into $\aleph_1$ Borel sets
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A G-delta-sigma that is not F-sigma?
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A compactness property for Borel sets
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Martin’s cone theorem and recursion theory