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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1302.4655math.NT
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具有正负二次Pisot基的数系中的整数

Integers in number systems with positive and negative quadratic Pisot base

Zuzana Masáková, Tomáš Vávra

摘要:

我们考虑了以$β$和$-β$为基的计数系统,对于二次Pisot数$β$,着重比较了以$β$为基的整数展开数的集合$\Z_β$和$\Z_{-β}$的组合结构. $-β$。我们的主要结果是比较语言的无限词$u_β$和$u_{-β}$编码顺序之间的距离连续$β$ -和$(-β)$ -整数。结果表明,对于$x^2-mx-m$的一类根$β$,语言一致,而对于其他二次皮索数,$u_β$的语言只能与$u_{-β}$的形态像的语言相识别。我们还研究了$(-β)$ -整数的群结构。

英文摘要:

We consider numeration systems with base $β$ and $-β$, for quadratic Pisot numbers $β$ and focus on comparing the combinatorial structure of the sets $\Z_β$ and $\Z_{-β}$ of numbers with integer expansion in base $β$, resp. $-β$. Our main result is the comparison of languages of infinite words $u_β$ and $u_{-β}$ coding the ordering of distances between consecutive $β$- and $(-β)$-integers. It turns out that for a class of roots $β$ of $x^2-mx-m$, the languages coincide, while for other quadratic Pisot numbers the language of $u_β$ can be identified only with the language of a morphic image of $u_{-β}$. We also study the group structure of $(-β)$-integers.

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