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arXiv 2101.03561math.NTmath.PR
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p-adic数域上根的期望个数

The Expected Number of Roots over The Field of p-adic Numbers

Roy Shmueli

摘要:

研究了$p$ -adic数域上随机多项式的根.对于具有独立同分布的随机首一多项式.系数在$\mathbb{Z}_p$中,我们得到了这个多项式的期望根数的估计。具体地,如果系数以相等的概率取值$\pm1$,则$p$根的预期数量收敛于$\left(p-1\right)/\left(p+1\right)$,因为多项式的次数趋向于$\infty$。

英文摘要:

We study the roots of a random polynomial over the field of $p$-adic numbers. For a random monic polynomial with i.i.d. coefficients in $\mathbb{Z}_p$, we obtain an estimate for the expected number of roots of this polynomial. In particular, if the coefficients take the values $\pm1$ with equal probability, the expected number of $p$-adic roots converges to $\left(p-1\right)/\left(p+1\right)$ as the degree of the polynomial tends to $\infty$.

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