arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1907.06752math.CO
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Johnson型图的独立数

Independence numbers of Johnson-type graphs

Danila Cherkashin, Sergei Kiselev

摘要:

我们考虑了$\mathbb{R}^n$中的一类距离图,并在某些情况下找到了它的独立数。按以下方式定义图$J_{\pm}(n,k,t)$:顶点集由来自$\{-1,0,1\}^n$的具有$k$非零坐标的所有向量组成;边用标量积$t$连接顶点对。在$t = 0$和$t = -1$的情况下,我们找到了$J_{\pm}(n,k,t)$对于$n > n_0 (k,t)$的独立数;对于$k = 3$的这些情况完全解决了。此外,还找到了负奇数$t$和$n > n_0 (k,t)$的独立数。

英文摘要:

We consider a family of distance graphs in $\mathbb{R}^n$ and find its independent numbers in some cases. Define graph $J_{\pm}(n,k,t)$ in the following way: the vertex set consists of all vectors from $\{-1,0,1\}^n$ with $k$ nonzero coordinates; edges connect the pairs of vertices with scalar product $t$. We find the independence number of $J_{\pm}(n,k,t)$ for $n > n_0 (k,t)$ in the cases $t = 0$ and $t = -1$; these cases for $k = 3$ are solved completely. Also the independence number is found for negative odd $t$ and $n > n_0 (k,t)$.

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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