arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1604.03354math.NTmath.DS
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关于非Pisot基的周期表示

On periodic representations in non-Pisot bases

Simon Baker, Zuzana Masáková, Edita Pelantová, Tomáš Vávra

摘要:

我们研究周期性的扩展在位置数系统的基础$β\in\C,\ |β|>1$,并与系数在一个有限的数字集$\A\subset\C.$我们感兴趣的是确定这些代数基地存在$\A\subset \Q(β),$,使所有元素的$\Q(β)$承认至少有一个最终的周期性表示与数字在$\A$。在本文中,我们证明了一个一般的结果,保证存在这样的$\A$。这一结果意味着当$β$是有理数或没有模$1$共轭的代数整数时,存在这样的$\A$。我们还考虑最终周期表示元素的$\Q(β)$的最大权力的代表是成比例的绝对值的代表数,一些普遍的常数。证明了如果$\Q(β)$的每个元素都有这样的表示,则$β$必是Pisot数或Salem数.这个结果推广了Schmidt \cite{Schmidt}的一个著名结果.

英文摘要:

We study periodic expansions in positional number systems with a base $β\in\C,\ |β|>1$, and with coefficients in a finite set of digits $\A\subset\C.$ We are interested in determining those algebraic bases for which there exists $\A\subset \Q(β),$ such that all elements of $\Q(β)$ admit at least one eventually periodic representation with digits in $\A$. In this paper we prove a general result that guarantees the existence of such an $\A$. This result implies the existence of such an $\A$ when $β$ is a rational number or an algebraic integer with no conjugates of modulus $1$. We also consider eventually periodic representations of elements of $\Q(β)$ for which the maximal power of the representation is proportional to the absolute value of the represented number, up to some universal constant. We prove that if every element of $\Q(β)$ admits such a representation then $β$ must be a Pisot number or a Salem number. This result generalises a well known result of Schmidt \cite{Schmidt}.

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