Question

Automorphisms group of a structure is a closed subgroup of the permutations over $\mathbb{N}$

score 232 · Answer 1 · 2019-04-13 19:59:09

232

Views

Automorphisms group of a structure is a closed subgroup of the permutations over $\mathbb{N}$

Published on 13 Apr 2019 - 19:59

score 77 · Answer 2 · 2026-03-20 03:33:51

77

Views

Equivalence relation induced by a group action is an analytic set

Published on 20 Mar 2026 - 3:33

score 68 · Answer 3 · 2026-03-25 04:41:21

68

Views

Is the usual metric on $\Bbb{N}^\Bbb{N}$ left invariant on $S(\Bbb{N})$?

Published on 25 Mar 2026 - 4:41

score 132 · Answer 4 · 2019-04-21 22:06:49

132

Views

Understanding the proof of Kechris' theorem 3.11

Published on 21 Apr 2019 - 22:06

score 503 · Answer 5 · 2019-04-23 16:30:39

503

Views

Separately continuous implies continuous

Published on 23 Apr 2019 - 16:30

score 322 · Answer 6 · 2019-04-29 08:22:21

322

Views

Image of a first category set for a typical continuous function

Published on 29 Apr 2019 - 8:22

score 206 · Answer 7 · 2019-04-30 12:44:44

206

Views

Compatibility of a metric with a left-invariant metric on a topological group

Published on 30 Apr 2019 - 12:44

score 120 · Answer 8 · 2019-05-10 04:52:00

120

Views

Intuition of Standard and Analytic Borel space

Published on 10 May 2019 - 4:52

score 153 · Answer 9 · 2026-03-22 18:30:13

153

Views

Baire space $\mathbb{N}^\mathbb{N}$ written as $\mathbb{R}$

Published on 22 Mar 2026 - 18:30

score 200 · Answer 10 · 2019-05-12 14:52:31

200

Views

Cantor-Bendixson Theorem Proof (existence of an ordinal)

Published on 12 May 2019 - 14:52

score 158 · Answer 11 · 2019-05-13 04:15:07

158

Views

Can we describe any subsets of $\mathbb{N}$ occurring in a late layer of the Constructible Universe?

Published on 13 May 2019 - 4:15

score 811 · Answer 12 · 2019-05-21 03:19:20

811

Views

Does every uncountable Borel subset of $\mathbb R$ contains a perfect subset？

Published on 21 May 2019 - 3:19

score 88 · Answer 13 · 2019-05-21 08:53:07

88

Views

$S(\Bbb{Q}^n)\subseteq \mathcal{P}(\Bbb{Q}^n)$ is Borel and the Borel action of $GL_n(\Bbb{Q})$ on $S(\Bbb{Q}^n)$

Published on 21 May 2019 - 8:53

score 147 · Answer 14 · 2019-05-28 20:40:38

147

Views

Is the convex hull of a countable set a Borel set?

Published on 28 May 2019 - 20:40

score 54 · Answer 15 · 2019-06-07 22:32:13

If $f:2^{\omega}\longrightarrow 2^{\omega}$ is a homeomorphism and $J\subseteq 2^{\omega}$ is a maximal ideal, then $f[J]$ is a maximal ideal?

List Question

Automorphisms group of a structure is a closed subgroup of the permutations over $\mathbb{N}$

Equivalence relation induced by a group action is an analytic set

Is the usual metric on $\Bbb{N}^\Bbb{N}$ left invariant on $S(\Bbb{N})$?

Understanding the proof of Kechris' theorem 3.11

Separately continuous implies continuous

Image of a first category set for a typical continuous function

Compatibility of a metric with a left-invariant metric on a topological group

Intuition of Standard and Analytic Borel space

Baire space $\mathbb{N}^\mathbb{N}$ written as $\mathbb{R}$

Cantor-Bendixson Theorem Proof (existence of an ordinal)

Can we describe any subsets of $\mathbb{N}$ occurring in a late layer of the Constructible Universe?

Does every uncountable Borel subset of $\mathbb R$ contains a perfect subset？

$S(\Bbb{Q}^n)\subseteq \mathcal{P}(\Bbb{Q}^n)$ is Borel and the Borel action of $GL_n(\Bbb{Q})$ on $S(\Bbb{Q}^n)$

Is the convex hull of a countable set a Borel set?

If $f:2^{\omega}\longrightarrow 2^{\omega}$ is a homeomorphism and $J\subseteq 2^{\omega}$ is a maximal ideal, then $f[J]$ is a maximal ideal?

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