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arXiv 2202.05010math.NTmath.GR
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关于随机游动的Hilbert不可约定理

Hilbert's irreducibility theorem via random walks

Lior Bary-Soroker, Daniele Garzoni

摘要:

设$G$是数域$K$上的连通线性代数群,$Γ$是$G(K)$的一个生成的Zerkki稠密子群,$Z\subseteq G(K)$是Serre意义下的一个薄集.证明了如果$G/\mathrm{R}_u(G)$是半单的,且$Z$满足一定的必要条件,则在$Γ$的Cayley图上的长随机游动以可忽略的概率击中$Z$的元素.我们推导出的推论伽罗瓦覆盖,特征多项式,和不动点的群体行动。我们也证明了类似的结果的情况下,$K$是一个整体功能领域。

英文摘要:

Let $G$ be a connected linear algebraic group over a number field $K$, let $Γ$ be a finitely generated Zariski dense subgroup of $G(K)$ and let $Z\subseteq G(K)$ be a thin set, in the sense of Serre. We prove that, if $G/\mathrm{R}_u(G)$ is semisimple and $Z$ satisfies certain necessary conditions, then a long random walk on a Cayley graph of $Γ$ hits elements of $Z$ with negligible probability. We deduce corollaries to Galois covers, characteristic polynomials, and fixed points in group actions. We also prove analogous results in the case where $K$ is a global function field.

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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