List questions from group-extensions

Published on 03 Jun 2023 - 11:32

106

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What is the free product with amalgamation with the trivial group?

Published on 04 Jun 2023 - 11:01

95

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Why isn't a coxeter group a HNN-extension?

Published on 20 Jun 2023 - 16:33

102

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Permutations of composition factors of a finite group of finite length.

Published on 05 Jul 2023 - 15:24

81

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Cocycles and nontrivial central extensions

Published on 08 Jul 2023 - 7:50

66

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Property preserved by tensor product/ epimorphic image/ extension

Published on 14 Jul 2023 - 16:23

63

Views

What is $H^2(U(1),\mathbb Z_2)$?

Published on 17 Jul 2023 - 7:12

21

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Groups extensions by linear cocycles

Published on 27 Jul 2023 - 18:42

177

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Best books on finite group extensions

Published on 29 Jul 2023 - 8:06

223

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Different approaches to classification of finite groups

Published on 31 Jul 2023 - 10:11

101

Views

What is the general notion of central charge?

Published on 31 Jul 2023 - 14:21

46

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For a coupling there does not exist an extension.

Published on 03 Aug 2023 - 4:01

86

Views

Abelian group as second cohomology group of a pair G,M

Published on 01 Sep 2023 - 12:30

26

Views

Splitting of an extension

Published on 09 Sep 2023 - 6:08

140

Views

How many $\mathbb{Z}_2$ extensions of alternating groups $A_n$ are there?

Published on 01 Oct 2023 - 12:02

List Question

HNN-extension and Centralizer

What is the free product with amalgamation with the trivial group?

Why isn't a coxeter group a HNN-extension?

Permutations of composition factors of a finite group of finite length.

Cocycles and nontrivial central extensions

Property preserved by tensor product/ epimorphic image/ extension

What is $H^2(U(1),\mathbb Z_2)$?

Groups extensions by linear cocycles

Best books on finite group extensions

Different approaches to classification of finite groups

What is the general notion of central charge?

For a coupling there does not exist an extension.

Abelian group as second cohomology group of a pair G,M

Splitting of an extension

How many $\mathbb{Z}_2$ extensions of alternating groups $A_n$ are there?

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