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arXiv 1707.07293math.GR
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关于有限群的循环子群的个数

On the number of cyclic subgroups of a finite group

Igor Lima, Martino Garonzi

摘要:

设$G$是一个有限群,$c(G)$是$G$的循环子群的个数.我们研究了函数$α(G) = c(G)/|G|$。我们探讨了它的基本性质,我们指出了一个连接与概率的换向。对于许多家庭$\mathscr{F}$的群体,我们的特点是群体$G \in \mathscr{F}$的$α(G)$是最大的,我们分类的群体$G$的$α(G) > 3/4$。我们还研究了给定群的直幂的循环子群的个数,导出了一个渐近结果,并刻画了当$G/N$是对称群时等式$α(G) = α(G/N)$的性质.

英文摘要:

Let $G$ be a finite group and let $c(G)$ be the number of cyclic subgroups of $G$. We study the function $α(G) = c(G)/|G|$. We explore its basic properties and we point out a connection with the probability of commutation. For many families $\mathscr{F}$ of groups we characterize the groups $G \in \mathscr{F}$ for which $α(G)$ is maximal and we classify the groups $G$ for which $α(G) > 3/4$. We also study the number of cyclic subgroups of a direct power of a given group deducing an asymptotic result and we characterize the equality $α(G) = α(G/N)$ when $G/N$ is a symmetric group.

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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