List questions from group-actions

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173

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Classifying sharply 3-transitive actions on spheres.

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60

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Vector field derived from Group action on smooth manifolds

Published on 01 Jan 2021 - 20:00

36

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Action of a Lie subgroup

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151

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Group action on the set of irreducible characters are orthogonal.

Published on 03 Jan 2021 - 11:52

98

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Let $G=N\rtimes H$ and the conjugacy action of $H$ on $N$ divide $N$ in two orbits. Show $N$ is abelian (and more).

Published on 30 Mar 2026 - 11:40

73

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Study of the number of the orbits of $S_4$ acting in $X$ with $|X|=36$

Published on 06 Apr 2026 - 22:47

50

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Smoothness of group action on Borel spaces

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55

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Action of $S_4$ on $3$ elements

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1.3k

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Why is left multiplication on a group bijective?

Published on 06 Jan 2021 - 0:39

63

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Determine whether the following definition defines a group action.

Published on 07 Jan 2021 - 21:21

61

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Finite generation for the ring of invariants

Published on 08 Jan 2021 - 11:12

64

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About smooth and free action

Published on 08 Jan 2021 - 16:08

191

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When are two elements of a group equivalent in terms of their action on an element of an orbit of X?

Published on 09 Jan 2021 - 7:10

144

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Group action on cohomology over a normal subgroup

Published on 30 Mar 2026 - 9:35

List Question

Reconstructions of Groups From Category of $G-\mathbf{Sets}$; Construction of a Group Homomorphism

Classifying sharply 3-transitive actions on spheres.

Vector field derived from Group action on smooth manifolds

Action of a Lie subgroup

Group action on the set of irreducible characters are orthogonal.

Let $G=N\rtimes H$ and the conjugacy action of $H$ on $N$ divide $N$ in two orbits. Show $N$ is abelian (and more).

Study of the number of the orbits of $S_4$ acting in $X$ with $|X|=36$

Smoothness of group action on Borel spaces

Action of $S_4$ on $3$ elements

Why is left multiplication on a group bijective?

Determine whether the following definition defines a group action.

Finite generation for the ring of invariants

About smooth and free action

When are two elements of a group equivalent in terms of their action on an element of an orbit of X?

Group action on cohomology over a normal subgroup

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