Question

What is the intuition for $p$-adic numbers in wiki-sense?

score 582 · Answer 1 · 2017-07-23 19:06:54

582

Views

What is the intuition for $p$-adic numbers in wiki-sense?

Published on 23 Jul 2017 - 19:06

score 48 · Answer 2 · 2017-07-31 14:16:15

48

Views

A dense subgroup of a non-perfect group is itself not perfect.

Published on 31 Jul 2017 - 14:16

score 243 · Answer 3 · 2026-03-26 16:26:31

243

Views

Maximal compact subgroup of $O(k,m)$

Published on 26 Mar 2026 - 16:26

score 96 · Answer 4 · 2026-03-31 23:36:29

96

Views

Is it true that if $R$ is a thick set, then for every syndetic set $S$, there is $g\in R$ such that $S\cap g^{-1}S \neq\emptyset$

Published on 31 Mar 2026 - 23:36

score 2k · Answer 5 · 2017-08-04 20:53:46

2k

Views

$\mathbb{R}$ and $\mathbb{R}^2$ isomorphic as groups?

Published on 04 Aug 2017 - 20:53

score 41 · Answer 6 · 2017-08-08 14:24:13

41

Views

Can a covering map from a neighborhood be extended to the whole space?

Published on 08 Aug 2017 - 14:24

score 304 · Answer 7 · 2017-08-11 14:59:48

304

Views

Let $G$ be a group locally isomorphic to $SL(2,\mathbb R)$, and with finite center, then $G$ is a covering space of $PSL(2,\mathbb R)$

Published on 11 Aug 2017 - 14:59

score 64 · Answer 8 · 2026-03-29 18:33:32

64

Views

Let $\Sigma$ be a Compact Riemann Surface of genus 1 then why $\mathbb{H}$ can't be a universal cover of $\Sigma$?

Published on 29 Mar 2026 - 18:33

score 1.1k · Answer 9 · 2017-08-14 22:47:25

1.1k

Views

Topology on the completion of a topological group

Published on 14 Aug 2017 - 22:47

score 241 · Answer 10 · 2026-03-26 09:42:33

241

Views

For $G$ profinite abelian, do we have $G \cong \varprojlim G/G^n$?

Published on 26 Mar 2026 - 9:42

score 99 · Answer 11 · 2017-08-18 18:54:15

99

Views

Is the closure of a topological torsion LCA group still topological torsion?

Published on 18 Aug 2017 - 18:54

score 1.9k · Answer 12 · 2017-08-22 07:40:18

1.9k

Views

Does there exist a space which has trivial fundamental group but is not path connected?

Published on 22 Aug 2017 - 7:40

score 1.2k · Answer 13 · 2026-03-27 08:57:13

1.2k

Views

Is the product of two topological groups a topological group?

Published on 27 Mar 2026 - 8:57

score 860 · Answer 14 · 2017-08-30 14:13:30

860

Views

Does collapsing the connected components of a topological space make it totally disconnected?

Published on 30 Aug 2017 - 14:13

score 1.8k · Answer 15 · 2017-09-01 19:41:38

1.8k

Views

The general linear group is closed

Published on 01 Sep 2017 - 19:41

List Question

What is the intuition for $p$-adic numbers in wiki-sense?

A dense subgroup of a non-perfect group is itself not perfect.

Maximal compact subgroup of $O(k,m)$

Is it true that if $R$ is a thick set, then for every syndetic set $S$, there is $g\in R$ such that $S\cap g^{-1}S \neq\emptyset$

$\mathbb{R}$ and $\mathbb{R}^2$ isomorphic as groups?

Can a covering map from a neighborhood be extended to the whole space?

Let $G$ be a group locally isomorphic to $SL(2,\mathbb R)$, and with finite center, then $G$ is a covering space of $PSL(2,\mathbb R)$

Let $\Sigma$ be a Compact Riemann Surface of genus 1 then why $\mathbb{H}$ can't be a universal cover of $\Sigma$?

Topology on the completion of a topological group

For $G$ profinite abelian, do we have $G \cong \varprojlim G/G^n$?

Is the closure of a topological torsion LCA group still topological torsion?

Does there exist a space which has trivial fundamental group but is not path connected?

Is the product of two topological groups a topological group?

Does collapsing the connected components of a topological space make it totally disconnected?

The general linear group is closed

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