Question

Effective Version of Boundedness Theorem

score 140 · Answer 1 · 2017-02-07 19:50:05

140

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Effective Version of Boundedness Theorem

Published on 07 Feb 2017 - 19:50

score 1.7k · Answer 2 · 2017-02-08 08:20:22

1.7k

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Is every $F_{\sigma\delta}$-set a set of points of convergence of a sequence of continuous functions?

Published on 08 Feb 2017 - 8:20

score 62 · Answer 3 · 2026-02-23 04:40:38

62

Views

Is every boldface $\mathbf{\Pi^0_2}$-definable quotient of Baire space Polish?

Published on 23 Feb 2026 - 4:40

score 163 · Answer 4 · 2017-02-22 22:53:36

163

Views

Is every sub-$\sigma$-algebra of $\mathcal{B}(\mathbb{R})$ "universally countably generated"?

Published on 22 Feb 2017 - 22:53

score 313 · Answer 5 · 2017-02-24 19:03:57

313

Views

First reflection theorem for $\Pi_1^1$ on $\Pi_1^1$ properties

Published on 24 Feb 2017 - 19:03

score 65 · Answer 6 · 2017-03-09 11:30:55

65

Views

Borel rank of the set of transitive well–founded relations

Published on 09 Mar 2017 - 11:30

score 949 · Answer 7 · 2017-03-11 15:46:31

949

Views

Is there a set $A \subset [0,1]$ such that both $A$ and $[0,1] \setminus A$ intersect every positive-measure set?

Published on 11 Mar 2017 - 15:46

score 644 · Answer 8 · 2017-03-13 00:09:23

644

Views

Is it possible to divide the real line into two disjoint totally disconnected spaces of equal cardinality?

Published on 13 Mar 2017 - 0:09

score 104 · Answer 9 · 2017-03-17 14:17:39

104

Views

On the intersection of non meager sets.

Published on 17 Mar 2017 - 14:17

score 98 · Answer 10 · 2017-03-23 00:52:37

98

Views

Perfect polish space $G_\delta$ partition.

Published on 23 Mar 2017 - 0:52

score 53 · Answer 11 · 2017-03-26 06:05:37

53

Views

Subsets characterized by a $\mathcal{L}_{\omega_1,\omega}$ sentence and invariant subsets of ${}^{\omega\times\omega}2$

Published on 26 Mar 2017 - 6:05

score 73 · Answer 12 · 2017-04-08 14:43:40

73

Views

Additive Class is closed under arbitrary union?

Published on 08 Apr 2017 - 14:43

score 194 · Answer 13 · 2026-03-26 12:35:11

194

Views

Spaces where each compact subset has compact closure: have they already been studied?

Published on 26 Mar 2026 - 12:35

score 64 · Answer 14 · 2023-03-26 16:08:41

64

Views

Infinite vector problem related to the continuum hypothesis

Published on 26 Mar 2023 - 16:08

score 53 · Answer 15 · 2023-03-31 15:23:13

53

Views

Proof of Baire's theorem on functions of first class

Published on 31 Mar 2023 - 15:23

List Question

Effective Version of Boundedness Theorem

Is every $F_{\sigma\delta}$-set a set of points of convergence of a sequence of continuous functions?

Is every boldface $\mathbf{\Pi^0_2}$-definable quotient of Baire space Polish?

Is every sub-$\sigma$-algebra of $\mathcal{B}(\mathbb{R})$ "universally countably generated"?

First reflection theorem for $\Pi_1^1$ on $\Pi_1^1$ properties

Borel rank of the set of transitive well–founded relations

Is there a set $A \subset [0,1]$ such that both $A$ and $[0,1] \setminus A$ intersect every positive-measure set?

Is it possible to divide the real line into two disjoint totally disconnected spaces of equal cardinality?

On the intersection of non meager sets.

Perfect polish space $G_\delta$ partition.

Subsets characterized by a $\mathcal{L}_{\omega_1,\omega}$ sentence and invariant subsets of ${}^{\omega\times\omega}2$

Additive Class is closed under arbitrary union?

Spaces where each compact subset has compact closure: have they already been studied?

Infinite vector problem related to the continuum hypothesis

Proof of Baire's theorem on functions of first class

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