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arXiv 2501.01906math.AGmath.NT
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通过点的伽罗瓦轨道的超曲面

Hypersurfaces passing through the Galois orbit of a point

Santa Clara University(圣克拉拉大学);Leiden University(莱顿大学);Georgia Institute of Technology(佐治亚理工学院)

Shamil Asgarli, Jonathan Love, Chi Hoi Yip

AI总结:

研究在特征为2的域上,是否存在不位于任何定义在域上的度数d超曲面上的点,结合算术几何方法证明了该结论。

摘要:

Asgarli, Ghioca和Reichstein证明了如果K是一个域且|K|>2,则对于任何正整数d和n,以及分离域扩张L/K,其度数m=组合数(n+d,d),存在一个点P∈P^n(L)不位于任何定义在K上的度数d超曲面上。他们询问当|K|=2时结果是否成立。我们通过结合算术几何中的各种思想,肯定地回答了这个问题。更一般地,我们证明对于每个正整数r和分离域扩张L/K,其度数r,存在一个点P∈P^n(L),使得定义在K上的度数d超曲面在P处的向量空间具有预期的维度。我们还讨论了具有特殊性质的超曲面线性系统应用。

英文摘要:

Asgarli, Ghioca, and Reichstein proved that if $K$ is a field with $|K|>2$, then for any positive integers $d$ and $n$, and separable field extension $L/K$ with degree $m=\binom{n+d}{d}$, there exists a point $P\in \mathbb{P}^n(L)$ which does not lie on any degree $d$ hypersurface defined over $K$. They asked whether the result holds when $|K| = 2$. We answer their question in the affirmative by combining various ideas from arithmetic geometry. More generally, we show that for each positive integer $r$ and separable field extension $L/K$ with degree $r$, there exists a point $P \in \mathbb{P}^n(L)$ such that the vector space of degree $d$ forms over $K$ that vanish at $P$ has the expected dimension. We also discuss applications to linear systems of hypersurfaces with special properties.

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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