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Liang Yu

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Name Liang Yu
Member for 2 years
Seen 22 hours ago
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Location China
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A mathematical logician.
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$\Delta^1_2$-well ordering vs $\Delta^1_3$

dec 15 at 17:41 Andres Caicedo 14.8k●1●43●81

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ZFC+``every analytical set is measurable"

apr 29 12 at 7:24 Liang Yu 670●5●8

 

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Answers
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10
Partitioning $\mathbb{R}$ into $\aleph_1$ Borel sets
7
Martin’s cone theorem and recursion theory
5
A compactness property for Borel sets
3
Vitali Sets vs Bernstein Sets…
3
A G-delta-sigma that is not F-sigma?
3
To find an element of a $\Pi^1_1$ set
3
Definition of HYP in $L_{\omega_1^{CK}}[a]$?
1
Probability that a Turing machine will nontrivially reduce a real

 

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