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arXiv 1605.07613math.CO
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9-超立方体的正方形是14-可着色的

The square of the 9-hypercube is 14-colorable

Juho Lauri

摘要:

由$Q_n$表示的$n$ -超立方体对于长度为$n$的每个比特串具有顶点,其中两个顶点在它们的汉明距离为1时相邻。用$χ_{\bar{k}}(n)$表示对$Q_n$着色以使得在至多$k$的距离处没有两个顶点接收相同颜色所需的最小颜色数目。等价地,$χ_{\bar{k}}(n)$表示划分$n$维汉明空间所需的具有至少$k+1$的最小距离的二进制码的最小数目。使用计算机搜索,我们改进后,已知的上界$n=9$显示,$13 \leq χ_{\bar{2}}(9) \leq 14$。

英文摘要:

The $n$-hypercube, denoted by $Q_n$, has a vertex for each bit string of length $n$ with two vertices adjacent whenever their Hamming distance is one. The minimum number of colors needed to color $Q_n$ such that no two vertices at a distance at most $k$ receive the same color is denoted by $χ_{\bar{k}}(n)$. Equivalently, $χ_{\bar{k}}(n)$ denotes the minimum number of binary codes with minimum distance at least $k+1$ required to partition the $n$-dimensional Hamming space. Using a computer search, we improve upon the known upper bound for $n=9$ by showing that $13 \leq χ_{\bar{2}}(9) \leq 14$.

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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