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arXiv 2211.03120math.CO
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用2-子群刻画子群完美码

Characterizing subgroup perfect codes by 2-subgroups

Junyang Zhang

摘要:

图$Γ$中的完美码是$V(Γ)$的子集$C$,使得$C$中没有两个顶点是相邻的,并且$V(Γ)\setminus C$中的每个顶点都恰好与$C$中的一个顶点相邻。设$G$是有限群,$C$是$G$的子集.如果存在$G$的Cayley图,且该图承认$C$为$G$的完美码,则称$C$为$G$的完美码.证明了$G$的子群$H$是$G$的完美码当且仅当$H$的Sylow $2$ -子群是$G$的完美码.这一结果为将一般群的子群完全码的研究简化为$2$ -群的子群完全码的研究提供了一条途径。作为应用,给出了特殊特殊线性群$\mathrm{PSL}(2,q)$的子群完美码的一个判定准则。

英文摘要:

A perfect code in a graph $Γ$ is a subset $C$ of $V(Γ)$ such that no two vertices in $C$ are adjacent and every vertex in $V(Γ)\setminus C$ is adjacent to exactly one vertex in $C$. Let $G$ be a finite group and $C$ a subset of $G$. Then $C$ is said to be a perfect code of $G$ if there exists a Cayley graph of $G$ admiting $C$ as a perfect code. It is proved that a subgroup $H$ of $G$ is a perfect code of $G$ if and only if a Sylow $2$-subgroup of $H$ is a perfect code of $G$. This result provides a way to simplify the study of subgroup perfect codes of general groups to the study of subgroup perfect codes of $2$-groups. As an application, a criterion for determining subgroup perfect codes of projective special linear groups $\mathrm{PSL}(2,q)$ is given.

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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