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This is one of the six possible cases for the image of the mod $p$ Galois Representation if $p$ is a non-surjective prime for $E$.

The label Nn means that $G$ is contained in the normalizer of the nonsplit Cartan subgroup but not in the nonsplit Cartan subgroup itself.

The label Nn.a.b denotes the subgroup of the normalizer of the nonsplit Cartan subgroup generated by $\begin{pmatrix}a&rb\\b&a\end{pmatrix}, \begin{pmatrix}1&0\\0&-1\end{pmatrix}.$ where $r$ be the least positive integer that generates $\F_p^*$.

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• Review status: reviewed
• Last edited by John Jones on 2018-06-19 18:51:41
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