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arXiv 1208.4332math.CO
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关于Barnette猜想和$H^{+-}$性质

On Barnette's Conjecture and $H^{+-}$ property

Jan Florek

摘要:

Barnette的一个猜想指出,每个3-连通三次二部平面图都有一个Hamilton圈,这等价于每个简单的偶数平面三角剖分允许其顶点集划分为两个子集,使得每个子集都导出一棵树。设$G$是一个简单的偶平面三角剖分,并假定${V_1, V_2, V_3}$是$G$的顶点集的3-着色.令$B_{i}$,$i = 1, 2, 3$,是度至少为6的$V_i$中所有顶点的集合。证明了如果诱导图$G[B_1 \cup B_2]$和$G[B_1 \cup B_3]$是无圈的,则满足以下性质:[6pt](1)对于每条路径$abc$,有可能将$G$的顶点集划分为两个子集,使得每个子集都导出一棵树,其中一个子集包含边$ab$并避免顶点$c$,[6pt](2)对于每条具有顶点$a$的路径$abc$,$G$的顶点集有可能划分成两个子集,使每个诱导树,其中一个包含路径$abc$。

英文摘要:

A conjecture of Barnette states that every 3-connected cubic bipartite plane graph has a Hamilton cycle, which is equivalent to the statement that every simple even plane triangulation admits a partition of its vertex set into two subsets so that each induces a tree. Let $G$ be a simple even plane triangulation and suppose that ${V_1, V_2, V_3}$ is a 3-coloring of the vertex set of $G$. Let $B_{i}$, $i = 1, 2, 3$, be the set of all vertices in $V_i$ of the degree at least 6. We prove that if induced graphs $G[B_1 \cup B_2]$ and $G[B_1 \cup B_3]$ are acyclic, then the following properties are satisfied: [6pt] (1) For every path $abc$ there is possible to partition the vertex set of $G$ into two subsets so that each induces a tree, and one of them contains the edge $ab$ and avoids the vertex $c$, [6pt] (2) For every path $abc$ with vertices $a$, $c$ of the same color there is possible to partition the vertex set of $G$ into two subsets so that each induces a tree, and one of them contains the path $abc$.

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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