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arXiv math/0512132math.NT
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Q的代数闭包上二次型的小零点

Small zeros of quadratic forms over the algebraic closure of Q

Lenny Fukshansky

摘要:

令$N \geq 2$为整数,$F$为$\bar{\mathbb Q}$上的$N$变量的二次型,$Z \subseteq \bar{\mathbb Q}^N$为$L$维子空间,$1 \leq L \leq N$ .证明了双线性空间$(Z,F)$的小高度极大全迷向子空间的存在性。这提供了一个模拟超过$\bar{\mathbb Q}$的一个著名的定理Vaaler证明了数域。我们利用我们的结果证明了$\bar{\mathbb Q}$上双线性空间的Witt分解的一个有效形式。我们还包括了$\bar{\mathbb Q}$上双线性空间的正交分解和等距结构的一些相关结果。这扩展了作者以前在数域上的结果。所有的高度界限都是明确的。

英文摘要:

Let $N \geq 2$ be an integer, $F$ a quadratic form in $N$ variables over $\bar{\mathbb Q}$, and $Z \subseteq \bar{\mathbb Q}^N$ an $L$-dimensional subspace, $1 \leq L \leq N$. We prove the existence of a small-height maximal totally isotropic subspace of the bilinear space $(Z,F)$. This provides an analogue over $\bar{\mathbb Q}$ of a well-known theorem of Vaaler proved over number fields. We use our result to prove an effective version of Witt decomposition for a bilinear space over $\bar{\mathbb Q}$. We also include some related effective results on orthogonal decomposition and structure of isometries for a bilinear space over $\bar{\mathbb Q}$. This extends previous results of the author over number fields. All bounds on height are explicit.

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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