arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.0482math.COcs.DM
收藏

大围长图的迫零数的界

Bounds for the Zero-Forcing Number of Graphs with Large Girth

Randy Davila, Franklin Kenter

摘要:

研究了无三角形图的迫零数。在无三角形的情况下,我们改进了平凡界$δ\le Z(G)$,其中$δ$是最小度。特别是,我们表明,$2 δ- 2 \le Z(G)$的周长至少为5的图,这可以进一步改善时,$G$有一个小的割集。利用这些结果,我们能够证明一个大类图的最小秩图补猜想。最后,我们推测$Z(G)$的下界作为围长、$g$和$δ$的函数而增加。

英文摘要:

We investigate the zero-forcing number for triangle-free graphs. We improve upon the trivial bound, $δ\le Z(G)$ where $δ$ is the minimum degree, in the triangle-free case. In particular, we show that $2 δ- 2 \le Z(G)$ for graphs with girth of at least 5, and this can be further improved when $G$ has a small cut set. Using these results, we are able to prove the Graph Complement Conjecture on minimum rank for a large class of graphs. Lastly, we make a conjecture that the lower bound for $Z(G)$ increases as a function of the girth, $g$, and $δ$.

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。

↑