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arXiv 2301.02663math.GR
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交错群的余度刻划

On the Characterization of Alternating Groups by Codegrees

Mallory Dolorfino, Luke Martin, Zachary Slonim, Yuxuan Sun, Yong Yang

摘要:

设$G$是有限群,$\mathrm{Irr}(G)$是$G$的所有不可约复特征标的集合.将$χ\in \mathrm{Irr}(G)$的余度定义为$\mathrm{cod}(χ):=\frac{|G:\mathrm{ker}(χ) |}{χ(1)}$,并用$\mathrm{cod}(G):=\{\mathrm{cod}(χ) \mid χ\in \mathrm{Irr}(G)\}$表示$G$的余度集。设$\mathrm{A}_n$是次数为$n \ge 5$的交替群。在本文中,我们表明,$\mathrm{A}_n$确定同构的$\mathrm{cod}(\mathrm{A}_n)$。

英文摘要:

Let $G$ be a finite group and $\mathrm{Irr}(G)$ the set of all irreducible complex characters of $G$. Define the codegree of $χ\in \mathrm{Irr}(G)$ as $\mathrm{cod}(χ):=\frac{|G:\mathrm{ker}(χ) |}{χ(1)}$ and denote by $\mathrm{cod}(G):=\{\mathrm{cod}(χ) \mid χ\in \mathrm{Irr}(G)\}$ the codegree set of $G$. Let $\mathrm{A}_n$ be an alternating group of degree $n \ge 5$. In this paper, we show that $\mathrm{A}_n$ is determined up to isomorphism by $\mathrm{cod}(\mathrm{A}_n)$.

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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