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Let $N \ge 1$. The curve $X_{\text{ns}}^{+}(N)$ is the modular curve $X(\Gamma_{\text{ns}}^{+}(N))$ where $\Gamma_{\text{ns}}^{+}(N)$ is the normalizer of the non-split Cartan subgroup $\Gamma_{\text{ns}}(N)$.

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  • Last edited by Andrew Sutherland on 2022-03-24 20:06:06
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