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arXiv 1507.02663math.NT
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具有限制域的广义除数函数的值域的稠密性

On the Density of Ranges of Generalized Divisor Functions with Restricted Domains

Colin Defant

摘要:

我们首先定义函数$σ_{t,k}$,它是具有限制域的广义除数函数。对于每个正整数$k$,我们证明,对于$r>1$,$σ_{-r,k}$的范围是区间$\displaystyle{\left[1,\frac{ζ(r)}{ζ((k+1)r)}\right)}$的子集。经过一些工作,我们定义常数$η_k$满足以下条件:如果$k\in\mathbb{N}$和$r>1$,则函数$σ_{-r,k}$的值域在$\displaystyle{\left[1,\frac{ζ(r)}{ζ((k+1)r)}\right)}$中稠密当且仅当$r\leqη_k$。我们以一个开放的问题结束。

英文摘要:

We begin by defining functions $σ_{t,k}$, which are generalized divisor functions with restricted domains. For each positive integer $k$, we show that, for $r>1$, the range of $σ_{-r,k}$ is a subset of the interval $\displaystyle{\left[1,\frac{ζ(r)}{ζ((k+1)r)}\right)}$. After some work, we define constants $η_k$ which satisfy the following: If $k\in\mathbb{N}$ and $r>1$, then the range of the function $σ_{-r,k}$ is dense in $\displaystyle{\left[1,\frac{ζ(r)}{ζ((k+1)r)}\right)}$ if and only if $r\leqη_k$. We end with an open problem.

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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