arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1608.03501math.CO
收藏

区别指数等于区别数加1的树

Trees with distinguishing index equal distinguishing number plus one

Saeid Alikhani, Sandi Klavžar, Florian Lehner, Samaneh Soltani

摘要:

图$G$的可区别数(指数)$D(G)$($D'(G)$)是最小整数$d$,使得$G$有一个顶点(边)用$d$标记,该标记仅由平凡自同构保持。已知对于每个图$G$,我们有$D'(G) \leq D(G) + 1$。在本说明中,我们刻画树,这个不等式是尖锐的。我们还证明了,如果$G$是一个连通的单圈图,那么$D'(G) = D(G)$。

英文摘要:

The distinguishing number (index) $D(G)$ ($D'(G)$) of a graph $G$ is the least integer $d$ such that $G$ has an vertex (edge) labeling with $d$ labels that is preserved only by the trivial automorphism. It is known that for every graph $G$ we have $D'(G) \leq D(G) + 1$. In this note we characterize trees for which this inequality is sharp. We also show that if $G$ is a connected unicyclic graph, then $D'(G) = D(G)$.

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。

↑