Timeline for Determine if a 2-cocycle is zero in $H^2(G,\mathbb C^\times)$
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| May 3, 2023 at 7:36 | history | edited | JKDASF | CC BY-SA 4.0 |
added 76 characters in body; edited title
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| May 3, 2023 at 7:15 | answer | added | Dave Benson | timeline score: 1 | |
| May 3, 2023 at 6:36 | comment | added | Achim Krause | It depends on how $G$ and $k^{\times}$ are given. But if $G$ is given by a list of its elements, and $k^{\times} $ as an explicit finitely generated abelian group, you have a presentation of $C^1(G, k^{\times}) $ and can compute whether your cocycle is in the image of the coboundary map using Smith normal form. | |
| May 3, 2023 at 6:15 | history | asked | JKDASF | CC BY-SA 4.0 |