曲线上的大度原始点

Maarten Derickx
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引用次数: 0

摘要

如果 $\mathbb Q$ 和 $K$ 是 $K$ 的唯一子域,则数域 $K$ 称为原始域。让 $X$ 是一条在 $\mathbb Q$ 上的好曲线,其属为 $g$。如果点的定义域$\mathbb Q(P)$是原始的,那么在$X$上度为$d$的点$P$就称为原始点。在这篇短文中,我们证明如果$X$有一个度数为$d> 2g$的除数,那么$X$就有无限多个度数为$d$的原始点。这是对哈瓦贾和西克塞克的结果的补充,哈瓦贾和西克塞克的结果表明,在某些条件下,低度点不是原始点。
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Large degree primitive points on curves
A number field $K$ is called primitive if $\mathbb Q$ and $K$ are the only subfields of $K$. Let $X$ be a nice curve over $\mathbb Q$ of genus $g$. A point $P$ of degree $d$ on $X$ is called primitive if the field of definition $\mathbb Q(P)$ of the point is primitive. In this short note we prove that if $X$ has a divisor of degree $d> 2g$, then $X$ has infinitely many primitive points of degree $d$. This complements the results of Khawaja and Siksek that show that points of low degree are not primitive under certain conditions.
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