List questions from descriptive-set-theory

Published on 24 Jun 2017 - 2:07

496

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Projections of sets in product sigma algebras over a countable set

Published on 01 Jul 2017 - 10:53

54

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How to define $B_{\omega}$ where $B_{n+1}=\{\text{limits of functions in $B_n$\}}$ and $B_0=\{\text{continuous real functions}\}$

Published on 07 Jul 2017 - 15:41

245

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Borel algebra mod meagre sets vs. Borel algebra mod sets of measure zero

Published on 10 Jul 2017 - 16:53

360

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There is an analytic set in $\mathscr N$ that is not Borel.

Published on 14 Jul 2017 - 3:33

110

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Show that $\alpha'_1$ is linear on the set of Baire class $1$ functions

Published on 15 Jul 2017 - 0:24

1k

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a simple description of the $\sigma$-field generated by a class of sets?

Published on 27 Jul 2017 - 4:05

146

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Books on difference hierachy

Published on 27 Jul 2017 - 11:43

406

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Is $[0,1]$ the union of $2^{\aleph_0}$ perfect sets which are pairwise disjoint?

Published on 06 Aug 2017 - 21:32

315

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Measurable non-analytic set

Published on 17 Aug 2017 - 13:20

174

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An $F_{\sigma \delta}$-set as $\limsup_n F_n$ of closed sets.

Published on 19 Aug 2017 - 13:29

458

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Which sets are Lebesgue measurable in $ZFC$?

Published on 20 Aug 2017 - 17:57

130

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Where does the collection of sets with positive upper density lie in the Borel hierarchy?

Published on 23 Aug 2017 - 3:07

147

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Power Sets of Ordinals in Two Transitive Models of AD

Published on 25 Aug 2017 - 21:34

158

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Is the union of less than $2^{\aleph_0}$ (closed) sets of empty interior, a set of empty interior?

Published on 27 Aug 2017 - 18:04

List Question

Turing degrees in $\Sigma_3^0$ and $\Pi_1^0$ sets.

Projections of sets in product sigma algebras over a countable set

How to define $B_{\omega}$ where $B_{n+1}=\{\text{limits of functions in $B_n$\}}$ and $B_0=\{\text{continuous real functions}\}$

Borel algebra mod meagre sets vs. Borel algebra mod sets of measure zero

There is an analytic set in $\mathscr N$ that is not Borel.

Show that $\alpha'_1$ is linear on the set of Baire class $1$ functions

a simple description of the $\sigma$-field generated by a class of sets?

Books on difference hierachy

Is $[0,1]$ the union of $2^{\aleph_0}$ perfect sets which are pairwise disjoint?

Measurable non-analytic set

An $F_{\sigma \delta}$-set as $\limsup_n F_n$ of closed sets.

Which sets are Lebesgue measurable in $ZFC$?

Where does the collection of sets with positive upper density lie in the Borel hierarchy?

Power Sets of Ordinals in Two Transitive Models of AD

Is the union of less than $2^{\aleph_0}$ (closed) sets of empty interior, a set of empty interior?

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