Question

Is a Borel subset in an analytic subset of a Polish space still analytic?

score 118 · Answer 1 · 2013-05-24 11:13:05

118

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Is a Borel subset in an analytic subset of a Polish space still analytic?

Published on 24 May 2013 - 11:13

score 737 · Answer 2 · 2013-05-29 19:24:23

737

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Question on the proof of a subspace of Polish space is Polish, iff it's a $G_\delta$ set.

Published on 29 May 2013 - 19:24

score 393 · Answer 3 · 2013-05-29 23:03:30

393

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The graph of Borel measurable function whose range is a separable metrisable space

Published on 29 May 2013 - 23:03

score 124 · Answer 4 · 2013-06-06 00:47:23

124

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Open neighborhoods of a $G_\delta$ set

Published on 06 Jun 2013 - 0:47

score 189 · Answer 5 · 2013-06-13 16:40:06

189

Views

Lowerbound of maximal cardinality of the set of pairwise disjoint non-null subset of the real line

Published on 13 Jun 2013 - 16:40

score 757 · Answer 6 · 2013-06-14 20:54:07

757

Views

Prerequisites for understanding Borel determinacy

Published on 14 Jun 2013 - 20:54

score 606 · Answer 7 · 2013-06-15 21:27:29

606

Views

Confusion in proof that $C(X,Y)$ is separable

Published on 15 Jun 2013 - 21:27

score 2.4k · Answer 8 · 2013-06-18 19:32:47

2.4k

Views

Uncountable union of multiples of measurable sets.

Published on 18 Jun 2013 - 19:32

score 240 · Answer 9 · 2013-06-21 21:39:38

240

Views

Question on constructing an auxiliary game of a closed game

Published on 21 Jun 2013 - 21:39

score 1.3k · Answer 10 · 2013-06-28 06:35:18

1.3k

Views

Is Ulam's theorem equivalent to Sierpiński's theorem?

Published on 28 Jun 2013 - 6:35

score 210 · Answer 11 · 2013-07-05 13:09:40

210

Views

Using Minimax Theorem of prove the determinacy of closed games?

Published on 05 Jul 2013 - 13:09

score 249 · Answer 12 · 2013-07-08 12:33:29

249

Views

Why universally and not just Borel policies

Published on 08 Jul 2013 - 12:33

score 122 · Answer 13 · 2026-02-23 10:06:09

122

Views

Is it true player II must have a winning strategy, if the winning set is a closed but not open set?

Published on 23 Feb 2026 - 10:06

score 1k · Answer 14 · 2013-07-23 02:23:10

1k

Views

Why in a space in which compact sets have empty interior, the closure of open sets is not totally bounded?

Published on 23 Jul 2013 - 2:23

score 721 · Answer 15 · 2026-02-23 06:24:14

721

Views

What can we say about closed sets in the Baire space that are neither open nor compact?

Published on 23 Feb 2026 - 6:24

List Question

Is a Borel subset in an analytic subset of a Polish space still analytic?

Question on the proof of a subspace of Polish space is Polish, iff it's a $G_\delta$ set.

The graph of Borel measurable function whose range is a separable metrisable space

Open neighborhoods of a $G_\delta$ set

Lowerbound of maximal cardinality of the set of pairwise disjoint non-null subset of the real line

Prerequisites for understanding Borel determinacy

Confusion in proof that $C(X,Y)$ is separable

Uncountable union of multiples of measurable sets.

Question on constructing an auxiliary game of a closed game

Is Ulam's theorem equivalent to Sierpiński's theorem?

Using Minimax Theorem of prove the determinacy of closed games?

Why universally and not just Borel policies

Is it true player II must have a winning strategy, if the winning set is a closed but not open set?

Why in a space in which compact sets have empty interior, the closure of open sets is not totally bounded?

What can we say about closed sets in the Baire space that are neither open nor compact?

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