中文

$n$ 变量随机整二次型为各向同性的概率是多少?

数论 2015-02-23 v2

摘要

我们证明了 Zp{\mathbb Z}_pnn 变量二次型中各向同性二次型的密度是 pp 的有理函数,其中该有理函数独立于 pp,并且我们明确确定了这个有理函数。因此,对于每个 nn,我们确定了 nn 变量随机整二次型为各向同性的概率。特别是,我们表明当二次型的系数在范围 [X,X][-X,X] 内独立且均匀分布且 XX\to\infty 时,随机整四元二次型为各向同性的概率约为 97.0%97.0\%。当根据高斯正交系综 (GOE) 选择随机整四元二次型时,各向同性的概率增加到约 98.3%98.3\%

关键词

引用

@article{arxiv.1311.5543,
  title  = {What is the probability that a random integral quadratic form in $n$ variables is isotropic?},
  author = {Manjul Bhargava and John Cremona and Tom Fisher},
  journal= {arXiv preprint arXiv:1311.5543},
  year   = {2015}
}

备注

This paper is superceded by a newer paper to appear shortly, entitled "What is the probability that a random integral quadratic form in $n$ variables has an integral zero?" (by M. Bhargava, J. E. Cremona, T. A. Fisher, N. G. Jones, and J. P. Keating)