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arXiv 0803.3337math.AG
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奇异曲线的典范模型

The Canonical Model of a Singular Curve

Steven L. Kleiman, Renato V. Martins

摘要:

本文给出了Rosenlicht关于任意完全积分曲线C的正则模型C'的结果的精炼陈述和现代证明。值得注意的是,我们证明了C和C'是双有理等价的当且仅当C是非超椭圆的,并且,如果C是非超椭圆的,那么C'等于C关于规范层ω的爆破。我们还证明了一些新的结果:我们确定了C'何时有理正规,算术正规,射影正规和线性正规。

英文摘要:

We give refined statements and modern proofs of Rosenlicht's results about the canonical model C' of an arbitrary complete integral curve C. Notably, we prove that C and C' are birationally equivalent if and only if C is nonhyperelliptic, and that, if C is nonhyperelliptic, then C' is equal to the blowup of C with respect to the canonical sheaf ω. We also prove some new results: we determine just when C' is rational normal, arithmetically normal, projectively normal, and linearly normal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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