Timeline for Reductive group with simply connected derived group has all root groups $\mathrm{SL}_2$
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Dec 2, 2022 at 17:27 | answer | added | Stefan Dawydiak | timeline score: 0 | |
| May 2, 2021 at 3:05 | comment | added | LSpice | Thanks to @spin for pointing out that I meant to refer to an answer by @nfdc23, not by @YCor. | |
| May 1, 2021 at 18:06 | answer | added | LSpice | timeline score: 6 | |
| May 1, 2021 at 16:34 | comment | added | LSpice | No, the fundamental group of $\operatorname{PGL}_2$ is $\mathbb Z/2\mathbb Z$, with generator the cocharacter $\varpi_\alpha = \frac1 2\alpha^\vee : t \mapsto \begin{pmatrix} t & 0 \\ 0 & 1 \end{pmatrix}$. | |
| May 1, 2021 at 16:08 | comment | added | LSpice | Specifically, I think that @YCor's answer answers your question. | |
| May 1, 2021 at 16:05 | comment | added | LSpice | Related: mathoverflow.net/questions/270205/… | |
| May 1, 2021 at 14:05 | answer | added | spin | timeline score: 3 | |
| May 1, 2021 at 14:04 | history | edited | YCor | CC BY-SA 4.0 |
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| May 1, 2021 at 13:40 | history | edited | YCor | CC BY-SA 4.0 |
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| May 1, 2021 at 13:39 | history | edited | Mikhail Borovoi |
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| May 1, 2021 at 13:39 | history | edited | YCor |
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| May 1, 2021 at 13:21 | review | First posts | |||
| May 1, 2021 at 14:18 | |||||
| May 1, 2021 at 13:10 | history | asked | LAGC | CC BY-SA 4.0 |