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Sós Permutations
The American Mathematical Monthly ( IF 0.5 ) Pub Date : 2021-04-27 , DOI: 10.1080/00029890.2021.1889911 Sarah Bockting-Conrad 1 , Yevgenia Kashina 1 , T. Kyle Petersen 1 , Bridget Eileen Tenner 1
中文翻译:
Sós排列
更新日期:2021-04-28
The American Mathematical Monthly ( IF 0.5 ) Pub Date : 2021-04-27 , DOI: 10.1080/00029890.2021.1889911 Sarah Bockting-Conrad 1 , Yevgenia Kashina 1 , T. Kyle Petersen 1 , Bridget Eileen Tenner 1
Affiliation
Abstract
Let for fixed real parameters α and β. For any positive integer n, define the Sós permutation π to be the lexicographically first permutation such that . In this article, we give a bijection between Sós permutations and regions in a partition of the parameter space . This allows us to enumerate these permutations and to obtain the following “three areas” theorem: in any vertical strip , with a Farey interval, there are at most three distinct areas of regions, and one of these areas is the sum of the other two.
中文翻译:
Sós排列
摘要
让 对于固定的实参α和β。对于任何正整数n,将Sós置换π定义为字典上的第一个置换,使得。在本文中,我们在参数空间分区中的Só置换与区域之间给出了双射。这使我们能够枚举这些排列并获得以下“三个区域”定理:在任何垂直带中, 和 在一个Farey区间中,最多有三个不同的区域,这些区域之一是其他两个区域的总和。