arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1911.03383math.NT
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唯一图与多重展开

Univoque graphs and multiple expansions

Yuru Zou, Jian Lu, Vilmos Komornik

摘要:

非整数基$q$上的唯一展开式在过去的三十年中已经有许多论文进行了研究。它们通常由标记有向图方便地生成。在本文的第一部分中,我们给出了一个精确的描述由这些图生成的序列的集合。第二部分利用唯一图的描述,研究了多重扩张。相反的唯一的扩展,我们证明了每个$j\ge 2$的集合$U_q^j$的号码正好$j$扩展是封闭的,只有当它是空的。此外,推广Sidorov的一个重要例子,我们证明了对于一大类基,$U_q^j$的豪斯多夫维数与$j$无关.在最后两节中,我们的结果通过许多例子来说明。

英文摘要:

Unique expansions in non-integer bases $q$ have been investigated in many papers during the last thirty years. They are often conveniently generated by labeled directed graphs. In the first part of this paper we give a precise description of the set of sequences generated by these graphs. Using the description of univoque graphs, the second part of the paper is devoted to the study of multiple expansions. Contrary to the unique expansions, we prove for each $j\ge 2$ that the set $U_q^j$ of numbers having exactly $j$ expansions is closed only if it is empty. Furthermore, generalizing an important example of Sidorov, we prove for a large class of bases that the Hausdorff dimension of $U_q^j$ is independent of $j$. In the last two sections our results are illustrated by many examples.

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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