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arXiv 1204.0495math.CO
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关于冠积图和联图的强度量维数

On the strong metric dimension of corona product graphs and join graphs

Dorota Kuziak, Ismael G. Yero, Juan A. Rodriguez-Velazquez

摘要:

设$G$是一个连通图.顶点$w$强分解$G$的顶点对$u$,$v$,如果存在包含$v$的某个最短$u-w$路径或包含$u$的某个最短$v-w$路径。一个顶点集$W$是$G$的强可解集,如果$G$的每对顶点都能被$W$的某个顶点强可解. $G$的强分解集的最小基数称为$G$的强度量维数。已知计算该不变量的问题是NP-困难的。因此,需要将计算乘积图的强度量维数的问题简化为计算因子图的某些参数的问题。证明了求两个图$G$和$H$的冠积$G\odot H$的强度量维数的问题可以转化为求$H$的团数的问题.作为研究的结果,我们表明,如果$H$有直径2,那么强度量维数的$G\odot H$是从强度量维数的$H$,如果$H$是不连通的或其直径大于2,那么强度量维数的$G\odot H$是从强度量维数的$K_1\odot H$,其中$K_1$表示平凡图。研究了联图的强度量维数。

英文摘要:

Let $G$ be a connected graph. A vertex $w$ strongly resolves a pair $u$, $v$ of vertices of $G$ if there exists some shortest $u-w$ path containing $v$ or some shortest $v-w$ path containing $u$. A set $W$ of vertices is a strong resolving set for $G$ if every pair of vertices of $G$ is strongly resolved by some vertex of $W$. The smallest cardinality of a strong resolving set for $G$ is called the strong metric dimension of $G$. It is known that the problem of computing this invariant is NP-hard. It is therefore desirable to reduce the problem of computing the strong metric dimension of product graphs, to the problem of computing some parameter of the factor graphs. We show that the problem of finding the strong metric dimension of the corona product $G\odot H$, of two graphs $G$ and $H$, can be transformed to the problem of finding certain clique number of $H$. As a consequence of the study we show that if $H$ has diameter two, then the strong metric dimension of $G\odot H$ is obtained from the strong metric dimension of $H$ and, if $H$ is not connected or its diameter is greater than two, then the strong metric dimension of $G\odot H$ is obtained from the strong metric dimension of $K_1\odot H$, where $K_1$ denotes the trivial graph. The strong metric dimension of join graphs is also studied.

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