Timeline for Determine if a 2-cocycle is zero in $H^2(G,\mathbb C^\times)$
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| May 3, 2023 at 9:31 | comment | added | Dave Benson | Computationally, you should never be working with complex numbers. Since most of them don't have names, they are represented by approximations, and that drastically changes whether something is a coboundary. | |
| May 3, 2023 at 7:47 | comment | added | Dave Benson | You can always reduce to the $|G|$th roots of unity, and often much smaller. | |
| May 3, 2023 at 7:32 | comment | added | JKDASF | Yes I have looked at it and failed because magma cannot compute second Cohomology with coefficient in $\mathbb C^*$ ( I want to work with $k=\mathbb C$). Will try reducing to finite subgroup though! | |
| May 3, 2023 at 7:21 | history | edited | Dave Benson | CC BY-SA 4.0 |
added 123 characters in body
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| May 3, 2023 at 7:15 | history | answered | Dave Benson | CC BY-SA 4.0 |