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arXiv 0809.1853math.AG
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平滑曲线双覆盖平面模型的极小度

The minimal degree of plane models of double covers of smooth curves

Dongsoo Shin

摘要:

如果$X$是一条平滑曲线,使得它的平面模型的最小阶与它的亏格相比不太小,那么在亏格上的某种温和条件下,$X$是另一条平滑曲线$Y$的双覆盖.但是,除了一些特殊情况外,对于平面模型的最小次数,目前还没有结果。本文利用基曲线$Y$的共角性和$X$与$Y$的亏格,给出了双覆盖$X$平面模型的最小次数的上、下界.特别地,在$Y$是超椭圆的情况下,上界等于下界。我们给出了一个双重覆盖的例子,它的度等于下界的平面模型。

英文摘要:

If $X$ is a smooth curve such that the minimal degree of its plane models is not too small compared with its genus, then $X$ has been known to be a double cover of another smooth curve $Y$ under some mild condition on the genera. However there are no results yet for the minimal degrees of plane models of double covers except some special cases. In this paper, we give upper and lower bounds for the minimal degree of plane models of the double cover $X$ in terms of the gonality of the base curve $Y$ and the genera of $X$ and $Y$. In particular, the upper bound equals to the lower bound in case $Y$ is hyperelliptic. We give an example of a double cover which has plane models of degree equal to the lower bound.

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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