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arXiv 1202.4976math.CO
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关于S_n的Cayley图的一个注记

A note on a Cayley graph of S_n

Guillaume Chapuy, Valentin Féray

摘要:

最近在图论中,一些作者研究了对称群S_n的由(1,i)转置生成的Cayley图的谱,其中2 <= i <= n。作了几次计算,得到了部分结果。本说明的目的是指出,正如P. Renteln也提到的那样,这个问题实际上已经在另一种情况下得到解决。事实上,它相当于研究对称群代数中所谓的朱西斯-墨菲元素的谱,这是很好理解的。前面提到的理论是现有理论的直接结果。我们还提出了一个相关的结果,从P. Biane,给出了这个谱的渐近描述。我们坚持这样一个事实,即本说明不包含任何新的结果,但只被写来传达信息从代数组合学社区图理论家。

英文摘要:

Recently in graph theory several authors have studied the spectrum of the Cayley graph of the symmetric group S_n generated by the transpositions (1, i) for 2 <= i <= n. Several conjectures were made and partial results were obtained. The purpose of this note is to point out that, as mentioned also by P. Renteln, this problem is actually already solved in another context. Indeed it is equivalent to studying the spectrum of so-called Jucys-Murphy elements in the algebra of the symmetric group, which is well understood. The aforementioned conjectures are direct consequences of the existing theory. We also present a related result from P. Biane, giving an asymptotic description of this spectrum. We insist on the fact that this note does not contain any new results, but has only been written to convey the information from the algebraic combinatorics community to graph theorists.

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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