List questions from central-extensions

Published on 20 Apr 2026 - 23:16

35

Views

If central extensions are isomorphic as principal bundles, are they isomorphic as extensions?

Published on 25 Mar 2026 - 6:05

81

Views

Reference request: Universal central extension of $\operatorname{PSl}_2(\mathbb Z)$ is the braid group $\mathcal B_3$.

Published on 25 Mar 2026 - 16:02

384

Views

What exactly is a universal central extension?

Published on 25 Mar 2026 - 4:38

37

Views

Comparing conjugacy classes in central extensions

Published on 25 Mar 2026 - 4:35

38

Views

Classifying central extensions of perfect groups

Published on 01 Apr 2026 - 16:31

17

Views

Central Extensions of the Quaternions

Published on 01 Apr 2026 - 11:57

41

Views

Multiplication map for centrally extended Lie group

Published on 25 Mar 2026 - 4:36

227

Views

Why do linear splitting maps of Lie Algebra central extensions induce cocycles?

Published on 25 Apr 2026 - 23:51

538

Views

Classification of projective representations in terms of linear representations of central extensions

Published on 05 Jul 2017 - 20:17

1.3k

Views

Central extensions versus semidirect products

Published on 11 Apr 2026 - 23:27

280

Views

Nilpotent groups can be constructed by means of abelian groups.

Published on 25 Mar 2026 - 4:40

113

Views

Quaternion group as a central extension of a $2$-group

Published on 01 May 2026 - 12:55

106

Views

Connection between central extensions and universal covering groups for projective representations

Published on 25 Mar 2026 - 4:36

137

Views

Group Cohomology and Pontryagin Duality

Published on 25 Mar 2026 - 4:40

List Question

Internal symmetries in abelian or non abelian groups

If central extensions are isomorphic as principal bundles, are they isomorphic as extensions?

Reference request: Universal central extension of $\operatorname{PSl}_2(\mathbb Z)$ is the braid group $\mathcal B_3$.

What exactly is a universal central extension?

Comparing conjugacy classes in central extensions

Classifying central extensions of perfect groups

Central Extensions of the Quaternions

Multiplication map for centrally extended Lie group

Why do linear splitting maps of Lie Algebra central extensions induce cocycles?

Classification of projective representations in terms of linear representations of central extensions

Central extensions versus semidirect products

Nilpotent groups can be constructed by means of abelian groups.

Quaternion group as a central extension of a $2$-group

Connection between central extensions and universal covering groups for projective representations

Group Cohomology and Pontryagin Duality

Trending Questions

Popular # Hahtags

Popular Questions