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arXiv 2407.02635math.CO
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关于广义彼得森图的{1,2}-距离平衡性

On $\{1,2\}$-distance-balancedness of generalized Petersen graphs

School of Mathematics and Statistics, Shandong University of Technology(山东理工大学数学与统计学院);Faculty of Mathematics and Physics, University of Ljubljana(卢布尔雅那大学数学物理学院);Faculty of Natural Sciences and Mathematics, University of Maribor(马里博尔大学自然科学与数学学院);Institute of Mathematics, Physics and Mechanics, Ljubljana(卢布尔雅那数学、物理与力学研究所)

Gang Ma, Jianfeng Wang, Sandi Klavžar

AI总结:

研究证明广义彼得森图在特定条件下具有或不具有距离平衡性,改进了已有结论并部分解决了相关猜想。

摘要:

一个连通图G的直径diam(G)≥ℓ时,若对于任意x,y∈V(G)满足d_G(x,y)=ℓ,都有|W_{xy}|=|W_{yx}|,则称G为ℓ-距离平衡图。证明了当k≥3且n>k(k+2)时,广义彼得森图GP(n,k)不为距离平衡图,而GP(k(k+2),k)是距离平衡图。这显著改进了Yang等人[电子期刊组合计学16(2009) #N33]的主要结果。此外还证明,当k≥6且k为偶数,且n>5/4k²+2k,或当k≥5且k为奇数,且n>7/4k²+3/4k时,GP(n,k)不为2-距离平衡图。这些结果部分解决了Miklavič和Šparl[离散应用数学244(2018) 143-154]的猜想。

英文摘要:

A connected graph $G$ of diameter ${\rm diam}(G) \ge \ell$ is $\ell$-distance-balanced if $|W_{xy}|=|W_{yx}|$ for every $x,y\in V(G)$ with $d_{G}(x,y)=\ell$, where $W_{xy}$ is the set of vertices of $G$ that are closer to $x$ than to $y$. It is proved that if $k\ge 3$ and $n>k(k+2)$, then the generalized Petersen graph $GP(n,k)$ is not distance-balanced and that $GP(k(k+2),k)$ is distance-balanced. This significantly improves the main result of Yang et al.\ [Electron.\ J.\ Combin.\ 16 (2009) \#N33]. It is also proved that if $k\ge 6$, where $k$ is even, and $n>\frac{5}{4}k^2+2k$, or if $k\ge 5$, where $k$ is odd, and $n>\frac{7}{4}k^2+\frac{3}{4}k$, then $GP(n,k)$ is not $2$-distance-balanced. These results partially resolve a conjecture of Miklavič and Šparl [Discrete Appl.\ Math.\ 244 (2018) 143--154].

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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