Question

Algorithms to determine the explicit forms of possible group extensions

score 150 · Answer 1 · 2026-04-29 12:55:04

150

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Algorithms to determine the explicit forms of possible group extensions

Published on 29 Apr 2026 - 12:55

score 68 · Answer 2 · 2026-04-26 20:54:39

68

Views

Basic assertion about central extensions

Published on 26 Apr 2026 - 20:54

score 239 · Answer 3 · 2026-05-06 14:30:45

239

Views

Virasoro algebra question: Is there a two-surface in Diff($S^1$) with a non-zero integral over the cocycle in $H^2(\mathfrak{g}, \mathbb{C})$?

Published on 06 May 2026 - 14:30

score 283 · Answer 4 · 2026-04-29 12:46:06

283

Views

Structure of affine Lie algebras

Published on 29 Apr 2026 - 12:46

score 55 · Answer 5 · 2026-05-07 10:07:58

55

Views

Haar measure construction for extended Lie Algebra

Published on 07 May 2026 - 10:07

score 215 · Answer 6 · 2026-05-07 14:21:30

215

Views

What is the explicit central extension given by the prequantization procedure (from functions on phase space to vector fields)?

Published on 07 May 2026 - 14:21

score 45 · Answer 7 · 2026-05-06 08:53:11

45

Views

What controls the central extensions of Lie algebras when the Lie Group is not compact?

Published on 06 May 2026 - 8:53

score 206 · Answer 8 · 2026-05-10 13:48:34

206

Views

Nilpotent Lie algebras are closed under extensions

Published on 10 May 2026 - 13:48

score 512 · Answer 9 · 2026-05-07 08:11:01

512

Views

Is every generator of $Z({\rm Spin}_n^{\epsilon}(q))$ a square element in finite spin group ${\rm Spin}_n^{\epsilon}(q)$?

Published on 07 May 2026 - 8:11

score 71 · Answer 10 · 2026-05-06 12:33:02

71

Views

Some clarifications required about the two extremes of general extensions (semi-direct products and central extensions)

Published on 06 May 2026 - 12:33

score 54 · Answer 11 · 2026-05-07 13:38:50

54

Views

Why are there only two central extensions corresponding to $H^2(C_p; \Bbb Z/p)$ which has $p$ elements?

Published on 07 May 2026 - 13:38

score 927 · Answer 12 · 2026-05-10 11:22:54

927

Views

Central extension of a Lie algebra, why is the bilinear form a 2-cocycle?

Published on 10 May 2026 - 11:22

score 65 · Answer 13 · 2026-05-10 15:42:43

65

Views

Central Extensions and Homomorphisms

Published on 10 May 2026 - 15:42

score 117 · Answer 14 · 2026-05-06 19:25:46

117

Views

Group Cohomology, Module Extensions, and Group Extensions, and $Ext^2_{\mathbb{Z}G}(\mathbb{Z},A)$

Published on 06 May 2026 - 19:25

score 65 · Answer 15 · 2026-05-07 01:44:10

65

Views

Why does the definition of cocyle in a central extension of a Lie algebra work?

Published on 07 May 2026 - 1:44

List Question

Algorithms to determine the explicit forms of possible group extensions

Basic assertion about central extensions

Virasoro algebra question: Is there a two-surface in Diff($S^1$) with a non-zero integral over the cocycle in $H^2(\mathfrak{g}, \mathbb{C})$?

Structure of affine Lie algebras

Haar measure construction for extended Lie Algebra

What is the explicit central extension given by the prequantization procedure (from functions on phase space to vector fields)?

What controls the central extensions of Lie algebras when the Lie Group is not compact?

Nilpotent Lie algebras are closed under extensions

Is every generator of $Z({\rm Spin}_n^{\epsilon}(q))$ a square element in finite spin group ${\rm Spin}_n^{\epsilon}(q)$?

Some clarifications required about the two extremes of general extensions (semi-direct products and central extensions)

Why are there only two central extensions corresponding to $H^2(C_p; \Bbb Z/p)$ which has $p$ elements?

Central extension of a Lie algebra, why is the bilinear form a 2-cocycle?

Central Extensions and Homomorphisms

Group Cohomology, Module Extensions, and Group Extensions, and $Ext^2_{\mathbb{Z}G}(\mathbb{Z},A)$

Why does the definition of cocyle in a central extension of a Lie algebra work?

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