Timeline for Is a "central" extension of $\mathbb{Z}/m\mathbb{Z}$ by $\mathrm{GL}_n$ necessarily split?
Current License: CC BY-SA 3.0
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| Nov 1, 2014 at 15:40 | comment | added | Kestutis Cesnavicius | Thanks. I should've asked this question with $k$ algebraically closed, as I've originally intended. | |
| Nov 1, 2014 at 14:50 | comment | added | Laurent Moret-Bailly | For a simple explicit example, you can take $k=\mathbb{R}$ and $n=1$, and take for $E$ the subgroup of $\mathrm{GL}_2$ generated by the center and the rotation $\begin{pmatrix}0&-1\\1&0\end{pmatrix}$. | |
| Nov 1, 2014 at 14:10 | history | answered | anon | CC BY-SA 3.0 |