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arXiv 2310.09459math.GR
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共轭类数目的一个新下界

A new lower bound for the number of conjugacy classes

Burcu Çınarcı, Thomas Michael Keller

AI总结:

本文针对有限群共轭类数提出一个对所有素数均紧的新下界猜想,并证明其对可解群及大素数情形的任意群成立。

摘要:

2003年,Héthelyi和Külshammer提出:若$G$是有限群且$p$是整除群阶的素数,则$k(G)\geq 2\sqrt{p-1}$,并证明了该猜想对可解群成立,且表明当$\sqrt{p-1}$为整数时该界是紧的。这引发了一系列研究活动,产生了许多推广和变体;特别是,如今该猜想对所有有限群均已知为真。在本文中,我们提出了一个自然的新且更强的猜想,该猜想对所有素数$p$都是紧的,并证明了它对可解群成立,且当$p$较大时,对任意群也成立。

英文摘要:

In 2003, Héthelyi and Külshammer proposed that if $G$ is a finite group and $p$ is a prime dividing the group order, then $k(G)\geq 2\sqrt{p-1}$, and they proved this conjecture for solvable $G$ and showed that it is sharp for those primes $p$ for which $\sqrt{p-1}$ is an integer. This initiated a flurry of activity, leading to many generalizations and variations of the result; in particular, today the conjecture is known to be true for all finite groups. In this note, we put forward a natural new and stronger conjecture, which is sharp for all primes $p$, and we prove it for solvable groups, and when $p$ is large, also for arbitrary groups.

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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