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arXiv 1507.02419math.NT
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根在单位圆上的$Z[x]$中的首一多项式

Monic polynomials in $Z[x]$ with roots in the unit disc

Pantelis A. Damianou

摘要:

本文是由Kronecker关于整系数的首一多项式的根都在单位圆上的一个旧结果而得到的。我们把这种多项式简称为克罗内克多项式。令$k(n)$表示次数为$n$的克罗内克多项式的数目。我们描述了这样的多项式的规范形式,并使用它来确定序列$k(n)$,小值的$n$。第一步是证明次数为$n$的克罗内克多项式的个数是有限的。这一事实包括在下面的定理由于克罗内克。该定理实际上给出了更多:这种多项式的非零根在单位圆的边界上。我们使用这一事实稍后表明,这些多项式的产品基本上是分圆多项式。

英文摘要:

This note is motivated by an old result of Kronecker on monic polynomials with integer coefficients having all their roots in the unit disc. We call such polynomials Kronecker polynomials for short. Let $k(n)$ denote the number of Kronecker polynomials of degree $n$. We describe a canonical form for such polynomials and use it to determine the sequence $k(n)$, for small values of $n$. The first step is to show that the number of Kronecker polynomials of degree $n$ is finite. This fact is included in the following theorem due to Kronecker. The theorem actually gives more: the non-zero roots of such polynomials are on the boundary of the unit disc. We use this fact later on to show that these polynomials are essentially products of cyclotomic polynomials.

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