arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.06809math.CO
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极图与可平面图的MC数分类

Extremal graphs and classification of planar graphs by MC-numbers

Yanhong Gao, Ping Li, Xueliang Li

摘要:

连通图$G$的边染色称为{ \em单色连通染色}(简称MC-染色),如果$G$的任意两个顶点通过$G$中的单色路连通.对于连通图$G$,$G$的{ \em单色连接数}(简称MC数),记为$mc(G)$,是使用该颜色数时,保证$G$具有单色连接着色的最大颜色数。这个概念是由Caro和Yuster在2011年提出的。他们证明了如果$G$不是$k$ -连通图,则$mc(G)\leq m-n+k$.在本文中,如果$G$是$k$ -连通图,但不是$(k+1)$ -连通图,我们用$mc(G)=m-n+k+1$和$mc(G)= m-n+k$刻画了所有图.我们还证明了$mc(G)\leq m-n+4$如果$G$是一个平面图,并分类所有的可平面图的单色连通数。

英文摘要:

An edge-coloring of a connected graph $G$ is called a {\em monochromatic connection coloring} (MC-coloring for short) if any two vertices of $G$ are connected by a monochromatic path in $G$. For a connected graph $G$, the {\em monochromatic connection number} (MC-number for short) of $G$, denoted by $mc(G)$, is the maximum number of colors that ensure $G$ has a monochromatic connection coloring by using this number of colors. This concept was introduced by Caro and Yuster in 2011. They proved that $mc(G)\leq m-n+k$ if $G$ is not a $k$-connected graph. In this paper we depict all graphs with $mc(G)=m-n+k+1$ and $mc(G)= m-n+k$ if $G$ is a $k$-connected but not $(k+1)$-connected graph. We also prove that $mc(G)\leq m-n+4$ if $G$ is a planar graph, and classify all planar graphs by their monochromatic connectivity numbers.

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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