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15
96
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HNN-extension and Centralizer

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#group-theory #group-presentation #group-extensions #free-product
110
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What is the free product with amalgamation with the trivial group?

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#group-theory #group-presentation #combinatorial-group-theory #group-extensions #free-product
96
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Why isn't a coxeter group a HNN-extension?

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#abstract-algebra #group-theory #combinatorial-group-theory #coxeter-groups #group-extensions
105
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Permutations of composition factors of a finite group of finite length.

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#abstract-algebra #sequences-and-series #group-theory #permutations #group-extensions
82
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Cocycles and nontrivial central extensions

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#group-theory #abelian-groups #group-cohomology #group-extensions
70
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Property preserved by tensor product/ epimorphic image/ extension

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#group-theory #group-extensions #nilpotent-groups
64
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What is $H^2(U(1),\mathbb Z_2)$?

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#group-theory #abelian-groups #group-cohomology #group-extensions
22
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Groups extensions by linear cocycles

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#linear-algebra #homological-algebra #abelian-groups #semidirect-product #group-extensions
178
Views

Best books on finite group extensions

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#group-theory #reference-request #homology-cohomology #group-cohomology #group-extensions
224
Views

Different approaches to classification of finite groups

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#group-theory #homology-cohomology #homological-algebra #group-cohomology #group-extensions
102
Views

What is the general notion of central charge?

Published on
#representation-theory #lie-groups #lie-algebras #group-extensions
48
Views

For a coupling there does not exist an extension.

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#abstract-algebra #group-theory #group-extensions
87
Views

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

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#group-theory #homology-cohomology #homological-algebra #group-cohomology #group-extensions
28
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Splitting of an extension

Published on
#abstract-algebra #simple-groups #group-extensions #free-abelian-group
141
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How many $\mathbb{Z}_2$ extensions of alternating groups $A_n$ are there?

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#group-theory #permutations #group-extensions

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