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arXiv 1002.1009math.NTmath.CO
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负基数制中的算术

Arithmetics in number systems with negative base

Z. Masáková, E. Pelantová, T. Vávra

摘要:

本文研究了Ito和Sadahiro提出的负基数制。本文主要研究有限分别数集合${\rm Fin}(-β)$和$\Z_{-β}$中的算术运算。整数$(-β)$ -扩展。我们发现,${\rm Fin}(-β)$是平凡的,如果$β$是小于黄金分割比$\frac12(1+\sqrt5)$。对于$β\geq\frac12(1+\sqrt5)$,我们证明了${\rm Fin}(-β)$是环,仅当$β$是没有负共轭的Pisot数或Salem数.证明了Ito和Sadahiro的猜想:如果$β$是具有正共轭的二次Pisot数,则${\rm Fin}(-β)$是环.对于二次皮索单位,我们确定了两个$(-β)$ -整数相加或相乘时可能出现的小数位数。

英文摘要:

We study the numeration system with negative basis, introduced by Ito and Sadahiro. We focus on arithmetic operations in the set ${\rm Fin}(-β)$ and $\Z_{-β}$ of numbers having finite resp. integer $(-β)$-expansions. We show that ${\rm Fin}(-β)$ is trivial if $β$ is smaller than the golden ratio $\frac12(1+\sqrt5)$. For $β\geq\frac12(1+\sqrt5)$ we prove that ${\rm Fin}(-β)$ is a ring, only if $β$ is a Pisot or Salem number with no negative conjugates. We prove the conjecture of Ito and Sadahiro that ${\rm Fin}(-β)$ is a ring if $β$ is a quadratic Pisot number with positive conjugate. For quadratic Pisot units we determine the number of fractional digits that may appear when adding or multiplying two $(-β)$-integers.

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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