Question

A profinite group is the inverse limit of all quotients by open normal subgroups

score 111 · Answer 1 · 2026-03-25 22:30:54

111

Views

A profinite group is the inverse limit of all quotients by open normal subgroups

Published on 25 Mar 2026 - 22:30

score 252 · Answer 2 · 2026-03-26 17:32:57

252

Views

Topological definition of Spin$(p,q)$?

Published on 26 Mar 2026 - 17:32

score 48 · Answer 3 · 2026-03-25 22:26:31

48

Views

Maps from a finitely generated pro-p group to $\mathbb F_p$ factors through Frattini quotient

Published on 25 Mar 2026 - 22:26

score 223 · Answer 4 · 2026-03-28 15:21:17

223

Views

Measure on the set of orbits of a flow via the von Neumann crossed products?

Published on 28 Mar 2026 - 15:21

score 115 · Answer 5 · 2026-02-23 02:40:44

115

Views

Is an Archimedean topological group of the reals isomorphic to $(\mathbb R,+)$?

Published on 23 Feb 2026 - 2:40

score 29 · Answer 6 · 2023-11-20 18:12:14

29

Views

showing that this specific functional is positive on $l^1(G)$ where $G$ is a discrete topological commutative group

Published on 20 Nov 2023 - 18:12

score 84 · Answer 7 · 2026-03-25 22:26:07

84

Views

Finite covers of $X$ and continuous profinite group actions

Published on 25 Mar 2026 - 22:26

score 23 · Answer 8 · 2026-03-26 22:54:12

23

Views

Ergodic transformations form a $G_\delta$ set in the weak topology of the automorphism group.

Published on 26 Mar 2026 - 22:54

score 85 · Answer 9 · 2023-11-24 22:46:11

85

Views

Prove that the closure $\overline{H}$ of a subgroup $H \subseteq G$ of a topological group, is a subgroup.

Published on 24 Nov 2023 - 22:46

score 78 · Answer 10 · 2026-03-27 04:16:58

78

Views

Why is coboundary $\sigma \to \sigma m-m$ automatically continuous?

Published on 27 Mar 2026 - 4:16

score 40 · Answer 11 · 2026-03-26 12:07:43

40

Views

Accumulation point in a topological group of orthogonal matrices over R

Published on 26 Mar 2026 - 12:07

score 71 · Answer 12 · 2023-11-27 11:24:25

71

Views

$(2)$ is not open in the $(6)$-adic topology

Published on 27 Nov 2023 - 11:24

score 62 · Answer 13 · 2026-03-25 22:25:18

62

Views

Finding open subgroups of profinite groups from description as an inverse limit

Published on 25 Mar 2026 - 22:25

score 73 · Answer 14 · 2023-11-30 18:44:29

73

Views

details in the proof: G a commutative Lie group and $(\pi, V)$ a finite-dim unitary representation of G. Then $\pi$ is irreducible iff dim $V = 1$

Published on 30 Nov 2023 - 18:44

score 48 · Answer 15 · 2023-11-30 22:06:26

48

Views

G abelian Lie group, $(\pi, V)$ a finite-dim unitary rep. $\exists $ mutually orthog. 1-dim invariant linear subspaces s.t $V= \bigoplus_i V_i$

Published on 30 Nov 2023 - 22:06

List Question

A profinite group is the inverse limit of all quotients by open normal subgroups

Topological definition of Spin$(p,q)$?

Maps from a finitely generated pro-p group to $\mathbb F_p$ factors through Frattini quotient

Measure on the set of orbits of a flow via the von Neumann crossed products?

Is an Archimedean topological group of the reals isomorphic to $(\mathbb R,+)$?

showing that this specific functional is positive on $l^1(G)$ where $G$ is a discrete topological commutative group

Finite covers of $X$ and continuous profinite group actions

Ergodic transformations form a $G_\delta$ set in the weak topology of the automorphism group.

Prove that the closure $\overline{H}$ of a subgroup $H \subseteq G$ of a topological group, is a subgroup.

Why is coboundary $\sigma \to \sigma m-m$ automatically continuous?

Accumulation point in a topological group of orthogonal matrices over R

$(2)$ is not open in the $(6)$-adic topology

Finding open subgroups of profinite groups from description as an inverse limit

details in the proof: G a commutative Lie group and $(\pi, V)$ a finite-dim unitary representation of G. Then $\pi$ is irreducible iff dim $V = 1$

G abelian Lie group, $(\pi, V)$ a finite-dim unitary rep. $\exists $ mutually orthog. 1-dim invariant linear subspaces s.t $V= \bigoplus_i V_i$

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