给出伽罗瓦点的光滑超曲面的线性自同构

Taro Hayashi
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引用次数: 1

摘要

设$X$为射影空间$\mathbb P^{n+1}$中次为$d\geq4$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。这个投影引出了函数域的扩展$\mathbb C(X)/\mathbb C(\mathbb P^n)$。点$p$被称为伽罗瓦点,如果扩展是伽罗瓦。本文利用线性自同构给出了$X$存在伽罗瓦点的充分必要条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Linear automorphisms of smooth hypersurfaces giving Galois points
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.
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