Question

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

score 235 · Answer 1 · 2026-04-14 00:25:40

235

Views

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

Published on 14 Apr 2026 - 0:25

score 83 · Answer 2 · 2026-05-07 17:04:47

83

Views

Equivalence relation induced by a group action is an analytic set

Published on 07 May 2026 - 17:04

score 72 · Answer 3 · 2026-05-11 01:11:27

72

Views

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

Published on 11 May 2026 - 1:11

score 135 · Answer 4 · 2026-04-09 13:51:26

135

Views

Understanding the proof of Kechris' theorem 3.11

Published on 09 Apr 2026 - 13:51

score 506 · Answer 5 · 2026-04-11 00:26:22

506

Views

Separately continuous implies continuous

Published on 11 Apr 2026 - 0:26

score 325 · Answer 6 · 2026-04-16 11:55:30

325

Views

Image of a first category set for a typical continuous function

Published on 16 Apr 2026 - 11:55

score 209 · Answer 7 · 2026-04-17 07:36:47

209

Views

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

Published on 17 Apr 2026 - 7:36

score 123 · Answer 8 · 2026-04-14 23:22:30

123

Views

Intuition of Standard and Analytic Borel space

Published on 14 Apr 2026 - 23:22

score 159 · Answer 9 · 2026-05-10 22:42:32

159

Views

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

Published on 10 May 2026 - 22:42

score 203 · Answer 10 · 2026-04-11 03:03:28

203

Views

Cantor-Bendixson Theorem Proof (existence of an ordinal)

Published on 11 Apr 2026 - 3:03

score 161 · Answer 11 · 2026-04-15 08:24:34

161

Views

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

Published on 15 Apr 2026 - 8:24

score 814 · Answer 12 · 2026-04-14 22:11:01

814

Views

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

Published on 14 Apr 2026 - 22:11

score 91 · Answer 13 · 2026-04-17 04:39:05

91

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 17 Apr 2026 - 4:39

score 150 · Answer 14 · 2026-04-12 22:33:21

150

Views

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

Published on 12 Apr 2026 - 22:33

score 57 · Answer 15 · 2026-04-16 03:26:38

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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