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arXiv 1908.05879math.CO
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树的多集维数

Multiset Dimensions of Trees

Yusuf Hafidh, Rizki Kurniawan, Suhadi Saputro, Rinovia Simanjuntak, Steven Tanujaya, Saladin Uttunggadewa

摘要:

设$G$是一个连通图,$W$是$G$的顶点集.顶点$v$相对于$W$的表示多重集$r_m (v|W)$被定义为$v$与$W$中的顶点之间的距离的多重集。如果对每对不同的顶点$u$和$v$都有$r_m (u |W) \neq r_m(v|W)$,则$W$称为$G$的m-分解集。如果$G$有一个m-分解集,那么最小的m-分解集的基数称为$G$的多集维数,记为$md(G)$ ;否则,我们称之为$md(G) = \infty$。在本文中,我们表明,对于一个树$T$的直径至少为2,如果$md(T) < \infty$,那么$md(T) \leq n-2$。我们推测,这个界是不尖锐的一般,并提出了一个尖锐的上限。我们还将提供毛虫和龙虾具有有限多集维数的充分必要条件。我们的结果部分解决了文[4]中提出的一个猜想和一个公开问题。

英文摘要:

Let $G$ be a connected graph and $W$ be a set of vertices of $G$. The representation multiset of a vertex $v$ with respect to $W$, $r_m (v|W)$, is defined as a multiset of distances between $v$ and the vertices in $W$. If $r_m (u |W) \neq r_m(v|W)$ for every pair of distinct vertices $u$ and $v$, then $W$ is called an m-resolving set of $G$. If $G$ has an m-resolving set, then the cardinality of a smallest m-resolving set is called the multiset dimension of $G$, denoted by $md(G)$; otherwise, we say that $md(G) = \infty$. In this paper, we show that for a tree $T$ of diameter at least 2, if $md(T) < \infty$, then $md(T) \leq n-2$. We conjecture that this bound is not sharp in general and propose a sharp upper bound. We shall also provide necessary and sufficient conditions for caterpillars and lobsters having finite multiset dimension. Our results partially settled a conjecture and an open problem proposed in [4].

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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