List questions from group-actions

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Where can I found an explanation of group cohomology from the point of view of invariants?

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Does a function between sets induce a homomorphism between the respective permutation groups?

Published on 08 Mar 2016 - 10:53

138

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Group action on subspaces of $\mathbb{R}^4$

Published on 10 Mar 2016 - 0:37

188

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Show $g.S = \{g.x|x\in S\}$ defines an action on the power set

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87

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Dihedral groups acting on Riemann surfaces

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318

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Exercise of Rick Miranda is wrong? Actions over Riemann sphere

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112

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Show that $ \mathcal{D}_H:=\bigcup_{g_i\in[H\backslash G]} g_i\cdot \mathcal{D} $ is a fundamental domain

Published on 17 Mar 2016 - 16:18

57

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size of group of row and column flips of a square board

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Definition of quotient of a topological space by a group action

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99

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Homorphism from $B(G)$ to $\mathbb{Z}$

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65

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How to show that $SL_2(\Bbb R)/SO_2(\Bbb R) \cong \Bbb H$?

Published on 19 Mar 2016 - 17:24

212

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In a finite p-group,H is a maximal sub group iff H is normal in G and |G:H|=p

Published on 25 Mar 2016 - 14:56

31

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Irreducible rep, group centre: $\pi$(z) $=\lambda$(z)v

Published on 29 Mar 2026 - 22:06

581

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The action of a topological group on the function space is continuous?

Published on 26 Mar 2026 - 14:24

List Question

Does a group action always induce a quotient?

Where can I found an explanation of group cohomology from the point of view of invariants?

Does a function between sets induce a homomorphism between the respective permutation groups?

Group action on subspaces of $\mathbb{R}^4$

Show $g.S = \{g.x|x\in S\}$ defines an action on the power set

Dihedral groups acting on Riemann surfaces

Exercise of Rick Miranda is wrong? Actions over Riemann sphere

Show that $ \mathcal{D}_H:=\bigcup_{g_i\in[H\backslash G]} g_i\cdot \mathcal{D} $ is a fundamental domain

size of group of row and column flips of a square board

Definition of quotient of a topological space by a group action

Homorphism from $B(G)$ to $\mathbb{Z}$

How to show that $SL_2(\Bbb R)/SO_2(\Bbb R) \cong \Bbb H$?

In a finite p-group,H is a maximal sub group iff H is normal in G and |G:H|=p

Irreducible rep, group centre: $\pi$(z) $=\lambda$(z)v

The action of a topological group on the function space is continuous?

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