Timeline for Is Deligne's central extension sofic?
Current License: CC BY-SA 3.0
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| Aug 20, 2017 at 9:12 | history | edited | Martin Sleziak | CC BY-SA 3.0 |
MarkDown for italics + link + (sofic=groups) tag
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| Jun 7, 2017 at 15:50 | history | edited | YCor | CC BY-SA 3.0 |
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| Apr 13, 2017 at 12:58 | history | edited | CommunityBot |
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| Dec 8, 2010 at 22:06 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 21:08 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 20:57 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 20:41 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 20:34 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 19:57 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 19:48 | answer | added | Andreas Thom | timeline score: 5 | |
| Dec 8, 2010 at 18:26 | comment | added | Greg Graviton | (The arxiv link is broken. Here a working one: arxiv.org/abs/0804.3968 ) | |
| Dec 8, 2010 at 18:15 | comment | added | HJRW | The interest of Deligne's example is not that it isn't residually finite. The interest is that it's a non-residually finite group which is a central extension of a residually finite (indeed, linear) group. | |
| Dec 8, 2010 at 18:12 | answer | added | HJRW | timeline score: 5 | |
| Dec 8, 2010 at 18:12 | comment | added | ndkrempel | A few points: you haven't said anything about $H$, for example it could be the trivial subgroup. In general, the largest such $H$ I thought was called the finite residuum of $G$ (although that doesn't seem very popular with Google), and is the intersection of all finite index subgroups of $G$. The distinction you make betewen "every finite index subgroup" and "every finite index normal subgroup" turns out not to matter - you can always drop by a finite index to gain normality (this doesn't depend on finite generation). | |
| Dec 8, 2010 at 17:13 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 17:07 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 16:59 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 16:53 | history | edited | Jon Bannon | CC BY-SA 2.5 |
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| Dec 8, 2010 at 16:46 | history | asked | Jon Bannon | CC BY-SA 2.5 |