Question

Action in $\mathbb{Z}[x_1,...,x_n]$

score 186 · Answer 1 · 2023-03-30 19:38:31

186

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Action in $\mathbb{Z}[x_1,...,x_n]$

Published on 30 Mar 2023 - 19:38

score 102 · Answer 2 · 2026-03-29 03:23:05

102

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A problem about semi-direct product which is a direct product

Published on 29 Mar 2026 - 3:23

score 71 · Answer 3 · 2023-04-04 22:22:31

Let $X$ be an irreducible variety, $G$ a finite subgroup of automorphisms of $X$. Then there is an open subset $U \subset X$ where $G$ acts freely.

score 156 · Answer 4 · 2023-04-05 06:35:41

156

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An exercise from Serre characterizing doubly transitive groups

Published on 05 Apr 2023 - 6:35

score 91 · Answer 5 · 2026-03-28 05:58:52

91

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action of cyclic group $n$ on $2n$ elements

Published on 28 Mar 2026 - 5:58

score 137 · Answer 6 · 2026-03-30 03:39:16

137

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What functions on 2-adic completion of the rationals are in the conjugacy class of $x+2^{\nu_2(x)}$?

Published on 30 Mar 2026 - 3:39

score 42 · Answer 7 · 2026-03-26 13:02:03

42

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Smooth action $G\curvearrowright M$ induces smooth action $TG \curvearrowright TM$

Published on 26 Mar 2026 - 13:02

score 50 · Answer 8 · 2026-03-28 05:59:59

50

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isotropy of the cotangent lift of a group action

Published on 28 Mar 2026 - 5:59

score 83 · Answer 9 · 2026-03-25 11:12:28

83

Views

Every proper and cobounded action is acylindrical.

Published on 25 Mar 2026 - 11:12

score 134 · Answer 10 · 2023-04-13 05:06:14

134

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How many orbits does this induced action of $S$ on $X\times X\times X$ have?

Published on 13 Apr 2023 - 5:06

score 168 · Answer 11 · 2026-02-23 08:25:56

168

Views

Stabilizer of a finite subset divides order of subset

Published on 23 Feb 2026 - 8:25

score 30 · Answer 12 · 2026-03-25 17:37:50

30

Views

Equivariant Loomis-Sikorski-Stone reprsentation theorem

Published on 25 Mar 2026 - 17:37

score 212 · Answer 13 · 2026-03-28 06:00:29

212

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Let $K/F$ be a Galois entension, and $Gal(K/F)=S_n$. Prove K is a split field of n degree irreducible polynomial over F.

Published on 28 Mar 2026 - 6:00

score 45 · Answer 14 · 2026-03-26 04:53:06

45

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Is there an elementary linear algebra mistake in Chow et al: The Ricci Flow II, appendix F about frame bundles?

Published on 26 Mar 2026 - 4:53

score 106 · Answer 15 · 2023-04-18 19:51:23

106

Views

Sufficient condition for a discrete homeomorphism group action to be properly discontinous.

Published on 18 Apr 2023 - 19:51

List Question

Action in $\mathbb{Z}[x_1,...,x_n]$

A problem about semi-direct product which is a direct product

Let $X$ be an irreducible variety, $G$ a finite subgroup of automorphisms of $X$. Then there is an open subset $U \subset X$ where $G$ acts freely.

An exercise from Serre characterizing doubly transitive groups

action of cyclic group $n$ on $2n$ elements

What functions on 2-adic completion of the rationals are in the conjugacy class of $x+2^{\nu_2(x)}$?

Smooth action $G\curvearrowright M$ induces smooth action $TG \curvearrowright TM$

isotropy of the cotangent lift of a group action

Every proper and cobounded action is acylindrical.

How many orbits does this induced action of $S$ on $X\times X\times X$ have?

Stabilizer of a finite subset divides order of subset

Equivariant Loomis-Sikorski-Stone reprsentation theorem

Let $K/F$ be a Galois entension, and $Gal(K/F)=S_n$. Prove K is a split field of n degree irreducible polynomial over F.

Is there an elementary linear algebra mistake in Chow et al: The Ricci Flow II, appendix F about frame bundles?

Sufficient condition for a discrete homeomorphism group action to be properly discontinous.

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