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Let $N \in \mathbb{N}$. 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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• Review status: beta
• Last edited by Eran Assaf on 2020-10-29 12:33:59
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