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arXiv 2101.04797math.AG
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给出Galois点的光滑超曲面的线性自同构

Linear automorphisms of smooth hypersurfaces giving Galois points

Taro Hayashi

摘要:

设$X$是射影空间$\mathbb P^{n+1}$中次数为$d\geq4$的光滑超曲面$X$.我们考虑$X$从$p\in\mathbb P^{n+1}$到平面$H\cong\mathbb P^n$的投影。这种投影导致了函数域$\mathbb C(X)/\mathbb C(\mathbb P^n)$的扩展。点$p$称为伽罗瓦点,如果扩展是伽罗瓦。本文利用线性自同构给出了$X$有Galois点的一个充要条件。

英文摘要:

Let $X$ be a smooth hypersurface $X$ of degree $d\geq4$ in a projective space $\mathbb P^{n+1}$. We consider a projection of $X$ from $p\in\mathbb P^{n+1}$ to a plane $H\cong\mathbb P^n$. This projection induces an extension of function fields $\mathbb C(X)/\mathbb C(\mathbb P^n)$. The point $p$ is called a Galois point if the extension is Galois. In this paper, we will give a necessary and sufficient conditions for $X$ to have Galois points by using linear automorphisms.

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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