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arXiv 1606.06362math.NTmath.AG
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具有尖点模的模曲线的广义雅可比矩阵上的有理挠率

Rational torsion on the generalized Jacobian of a modular curve with cuspidal modulus

Takao Yamazaki, Yifan Yang

摘要:

研究了模曲线$X_0(N)$关于其上所有尖点之和的简化除子的广义雅可比矩阵$\widetilde{J}_0(N)$,当$N$是素数$\geq 5$的幂时,证明了有理扭点群$\widetilde{J}_0(N)(\mathbb{Q})_{\mathrm{Tor}}$比经典Jacobian小小于.

英文摘要:

We consider the generalized Jacobian $\widetilde{J}_0(N)$ of a modular curve $X_0(N)$ with respect to a reduced divisor given by the sum of all cusps on it. When $N$ is a power of a prime $\geq 5$, we exhibit that the group of rational torsion points $\widetilde{J}_0(N)(\mathbb{Q})_{\mathrm{Tor}}$ tends to be much smaller than the classical Jacobian.

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