List questions from group-actions

Published on 16 Dec 2015 - 6:33

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In what sense is this action of $\mathbb R$ on $T$ lifted to an action of $\pi_1(T)\times\mathbb R$ on $\mathbb R^2$?

Published on 18 Dec 2015 - 7:40

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The closure of $\mathbb{Z\times Z\times R}$ in Homeo$(\mathbb R^2)$ is the group of translations of $\mathbb R^2$

Published on 18 Dec 2015 - 13:54

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For a subgroup $H$ of a group $G$, how many cosets are there?

Published on 20 Dec 2015 - 2:23

623

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How to describe the points of a quotient stack?

Published on 20 Dec 2015 - 11:33

214

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$G$-graded vector space and module

Published on 20 Dec 2015 - 23:50

102

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A Weaker Notion of a Flow in a Metric Space

Published on 24 Feb 2026 - 9:53

364

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Let $G = PSL(2,q)$ with $q$ odd and $H$ be a subgroup of even order. Then the centralizer of an involution in $H$ is a dihedral group.

Published on 23 Dec 2015 - 13:40

45

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Group actions on a set

Published on 23 Dec 2015 - 15:08

285

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Group Action and centraliser

Published on 25 Dec 2015 - 11:48

880

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Mobius transformation and Group action

Published on 27 Mar 2026 - 13:46

2.3k

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Classify orbits of conjugating action on $\mathrm{GL}_2(\mathbb{C})$

Published on 27 Dec 2015 - 17:33

2.1k

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Stabilizer, Kernel and Orbit of the right action.

Published on 02 Jan 2016 - 21:59

433

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How are $G$-modules and linear group actions different

Published on 07 Jan 2016 - 18:12

70

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If $G$ acts such that $\mbox{fix}(g) \in \{0,3\}$ for $g \ne 1$, and stabilizers are t.i. subgroups, then the Sylow $3$-subgroups have maximal class

Published on 08 Jan 2016 - 23:12

List Question

If $A$ is $G$ - invariant then so is $\bar A$

In what sense is this action of $\mathbb R$ on $T$ lifted to an action of $\pi_1(T)\times\mathbb R$ on $\mathbb R^2$?

The closure of $\mathbb{Z\times Z\times R}$ in Homeo$(\mathbb R^2)$ is the group of translations of $\mathbb R^2$

For a subgroup $H$ of a group $G$, how many cosets are there?

How to describe the points of a quotient stack?

$G$-graded vector space and module

A Weaker Notion of a Flow in a Metric Space

Let $G = PSL(2,q)$ with $q$ odd and $H$ be a subgroup of even order. Then the centralizer of an involution in $H$ is a dihedral group.

Group actions on a set

Group Action and centraliser

Mobius transformation and Group action

Classify orbits of conjugating action on $\mathrm{GL}_2(\mathbb{C})$

Stabilizer, Kernel and Orbit of the right action.

How are $G$-modules and linear group actions different

If $G$ acts such that $\mbox{fix}(g) \in \{0,3\}$ for $g \ne 1$, and stabilizers are t.i. subgroups, then the Sylow $3$-subgroups have maximal class

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