List questions from group-actions

Published on 04 Aug 2020 - 15:35

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Is a topologically transitive action on a second countable space point transitive?

Published on 06 Aug 2020 - 11:10

255

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Existence of Quotients in Locally Ringed Spaces

Published on 23 Feb 2026 - 12:26

145

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Understanding some induced exact sequence of $G$-modules

Published on 31 Mar 2026 - 5:49

39

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Let $K\unlhd G$ be abelian for finite $G$, and $\Omega$, the set of all transversals of $K$ in $G$. Then $G$ acts by left multiplication on $\Omega$.

Published on 07 Aug 2020 - 21:28

56

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Well-definedness of some map over $G$-modules

Published on 31 Mar 2026 - 5:40

29

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How to calculate $Card(Stab(\mathbb{N}^*_k) $?

Published on 08 Aug 2020 - 15:36

150

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Equivariant Diffeomorphism $S^2 \times S^3$ to itself with respect to the following $\mathbb{Z}_4$ action

Published on 25 Mar 2026 - 22:05

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What is the intuition behind the definition of the action of a group on a set? Why do we call a homomorphism $G\to\mathcal S(X)$ a "representation"?

Published on 11 Aug 2020 - 9:41

561

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Orbit-stabilizer for algebraic groups

Published on 11 Aug 2020 - 13:52

203

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Order of the group of commuting elements in a finite group

Published on 12 Aug 2020 - 18:07

107

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Regular normal subgroups.

Published on 14 Aug 2020 - 2:37

77

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Orbits of the action of $SL(n)$ over $\mathbb{P}(Sym(n))$

Published on 14 Aug 2020 - 21:01

181

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Equivalent conditions for covering space actions

Published on 15 Aug 2020 - 3:29

124

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How to convince myself (imagine) that $\Bbb S^1$-action on $\Bbb S^3$ fixes a circle of sphere?

Published on 16 Aug 2020 - 12:42

List Question

Orbits for Borel subgroup action

Is a topologically transitive action on a second countable space point transitive?

Existence of Quotients in Locally Ringed Spaces

Understanding some induced exact sequence of $G$-modules

Let $K\unlhd G$ be abelian for finite $G$, and $\Omega$, the set of all transversals of $K$ in $G$. Then $G$ acts by left multiplication on $\Omega$.

Well-definedness of some map over $G$-modules

How to calculate $Card(Stab(\mathbb{N}^*_k) $?

Equivariant Diffeomorphism $S^2 \times S^3$ to itself with respect to the following $\mathbb{Z}_4$ action

What is the intuition behind the definition of the action of a group on a set? Why do we call a homomorphism $G\to\mathcal S(X)$ a "representation"?

Orbit-stabilizer for algebraic groups

Order of the group of commuting elements in a finite group

Regular normal subgroups.

Orbits of the action of $SL(n)$ over $\mathbb{P}(Sym(n))$

Equivalent conditions for covering space actions

How to convince myself (imagine) that $\Bbb S^1$-action on $\Bbb S^3$ fixes a circle of sphere?

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