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$X_{\text{ns}}(N)$ is the modular curve $X_H$ for $H\le \GL_2(\widehat\Z)$ the inverse image of a Cartan subgroup of $\GL_2(\Z/N\Z)$ that is nonsplit at every prime dividing $N$.

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  • Review status: beta
  • Last edited by Asimina Hamakiotes on 2024-03-18 19:25:44
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