List questions from group-actions

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Points of a quotient stack as a section of a contracted product

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121

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Arnold Math Methods

Published on 10 Apr 2026 - 16:26

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Doubts in the action of $D_4$ on the set of $2$-colorings of a square.

Published on 29 Mar 2026 - 18:11

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Every $p$-elementary abelian group is characteristically simple

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Conditions under which there can be group action of $D_4$ on the set of $2$-colorings of a regular hexagon.

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45

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invariant closed subset under group scheme action (Mumford GIT)

Published on 26 Mar 2026 - 1:00

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example for $K\rtimes H\cong G\rtimes H$ and $K\ncong G$

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Action of a crystallographic group on $\mathbb{R}^n$

Published on 09 Apr 2026 - 7:50

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Crystallographic group property

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Is a finitely generated equivariant module always equivariantly finitely generated?

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47

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Orbits of action of $GL(m, \mathbb{Z}_{p^n})$ on the set of all subgroups of ${\mathbb{Z}_{p^n}}^m$.

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131

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Transitive group action in cube and icosahedral group

Published on 11 Apr 2026 - 18:41

135

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Mackey's definition of group action

Published on 11 Apr 2026 - 10:05

128

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Action on group cohomology

Published on 31 Mar 2026 - 9:37

List Question

Showing homogeneity of a quotient Riemannian manifold quotiented by a discrete subgroup .

Points of a quotient stack as a section of a contracted product

Arnold Math Methods

Doubts in the action of $D_4$ on the set of $2$-colorings of a square.

Every $p$-elementary abelian group is characteristically simple

Conditions under which there can be group action of $D_4$ on the set of $2$-colorings of a regular hexagon.

invariant closed subset under group scheme action (Mumford GIT)

example for $K\rtimes H\cong G\rtimes H$ and $K\ncong G$

Action of a crystallographic group on $\mathbb{R}^n$

Crystallographic group property

Is a finitely generated equivariant module always equivariantly finitely generated?

Orbits of action of $GL(m, \mathbb{Z}_{p^n})$ on the set of all subgroups of ${\mathbb{Z}_{p^n}}^m$.

Transitive group action in cube and icosahedral group

Mackey's definition of group action

Action on group cohomology

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