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arXiv 2403.02205math.CO
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度为 $p^l-1$ 的循环图中的完美码

Perfect codes in circulant graphs of degree $p^l-1$

Xiaomeng Wang, Oriol Serra, Shou-Jun Xu, Sanming Zhou

AI总结:

本文研究度为 $p^l-1$ 的循环图中的完美码,给出其存在的充要条件、完整构造及完美码数量下界,推广了 $l=1$ 的结果。

摘要:

图中的完美码是该图的一个独立集,使得集合外的每个顶点都恰好与集合中的一个顶点相邻。循环图是循环群的 Cayley 图。本文研究度为 $p^l-1$ 的循环图中的完美码,其中 $p$ 是素数且 $l\ge1$。我们得到了此类循环图允许存在完美码的充要条件,给出了所有允许存在完美码的此类循环图的构造,并证明了此类循环图中不同完美码数量的下界。这推广了 $l=1$ 情形的已知结果,并为循环图中完美码的存在性与结构这一一般性问题提供了洞见。

英文摘要:

A perfect code in a graph is an independent set of the graph such that every vertex outside the set is adjacent to exactly one vertex in the set. A circulant graph is a Cayley graph of a cyclic group. In this paper we study perfect codes in circulant graphs of degree $p^l - 1$, where $p$ is a prime and $l \ge 1$. We obtain a necessary and sufficient condition for such a circulant graph to admit perfect codes, give a construction of all such circulant graphs which admit perfect codes, and prove a lower bound on the number of distinct perfect codes in such a circulant graph. This extends known results for the case $l=1$ and provides insight on the general problem on the existence and structure of perfect codes in circulant graphs.

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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