arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.0895math.CO
收藏

3-控制-临界图的匹配与因子临界性

Matching and Factor-Critical Property in 3-Dominating-Critical Graphs

Tao Wang, Qinglin Yu

摘要:

设$γ(G)$是图$G$的控制数.图$G$是\emph{domination-vertex-critical}或\emph{$γ$-vertex-critical},如果对每个顶点$v \in V(G)$有$γ(G-v)< γ(G)$。本文证明了:设$G$是$γ$ -点临界图,且$γ(G)=3$ . (1)若$G$为偶数阶且无$K_{1,6}$,则$G$有完美匹配;(2)若$G$为奇数阶且无$K_{1,7}$,则$G$有近似完美匹配,只有三个例外.这些结果改进了已有的结果。

英文摘要:

Let $γ(G)$ be the domination number of a graph $G$. A graph $G$ is \emph{domination-vertex-critical}, or \emph{$γ$-vertex-critical}, if $γ(G-v)< γ(G)$ for every vertex $v \in V(G)$. In this paper, we show that: Let $G$ be a $γ$-vertex-critical graph and $γ(G)=3$. (1) If $G$ is of even order and $K_{1,6}$-free, then $G$ has a perfect matching; (2) If $G$ is of odd order and $K_{1,7}$-free, then $G$ has a near perfect matching with only three exceptions. All these results improve the known results.

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。

↑