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arXiv 1404.0950math.CO
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Hamming图中的$s$ -逃逸码

$s$-Elusive Codes in Hamming Graphs

Daniel R. Hawtin

摘要:

码是汉明图的顶点集的子集。码的$s$ -邻居的集合是距其最近码字的汉明距离为$s$的所有顶点的集合。一个码$C$是$s$ -难以捉摸的,如果存在一个不同的码$C'$,它在汉明图的全自同构群下等价于$C$,使得$C$和$C'$具有相同的$s$ -邻居集。本文证明了$s$ -难以捉摸码的最小距离至多为$2s+2$,且最小距离至少为$2s+1$的$s$ -难以捉摸码产生具有一定参数的$q$ -元$t$ -设计.这导致了以下的构造:$1$ -难以捉摸且完全传递的码的无限族,$2$ -难以捉摸的码的无限族,以及$3$ -难以捉摸的码的单个示例。还提供了一些关于难以捉摸的代码的开放性问题的答案。

英文摘要:

A code is a subset of the vertex set of a Hamming graph. The set of $s$-neighbours of a code is the set of all vertices at Hamming distance $s$ from their nearest codeword. A code $C$ is $s$-elusive if there exists a distinct code $C'$ that is equivalent to $C$ under the full automorphism group of the Hamming graph such that $C$ and $C'$ have the same set of $s$-neighbours. It is proved here that the minimum distance of an $s$-elusive code is at most $2s+2$, and that an $s$-elusive code with minimum distance at least $2s+1$ gives rise to a $q$-ary $t$-design with certain parameters. This leads to the construction of: an infinite family of $1$-elusive and completely transitive codes, an infinite family of $2$-elusive codes, and a single example of a $3$-elusive code. Answers to several open questions on elusive codes are also provided.

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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