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arXiv 1703.03320math.CO
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赋权图的独立-控制对偶

Independence-Domination duality in weighted graphs

Ron Aharoni, Irina Gorelik

摘要:

给定图$G$的顶点集的一个划分${\mathcal V}=(V_1, \ldots,V_m)$,{ \em独立断面}(IT)是$G$中包含每个$V_i$的一个顶点的独立集. { \em分数IT}是$V(G)$上的非负实值函数,其表示具有至少$1$的总权重的每个部分,并且作为向量属于图中独立集的关联向量的凸包。已知如果由每个$k$部分$V_i$的并导出的图的控制数至少为$k$,则存在分数IT.我们证明了这个结果的一个加权形式.这是一个特殊情况下的一般猜想,对加权版本的对偶现象,独立和控制之间的对图。

英文摘要:

Given a partition ${\mathcal V}=(V_1, \ldots,V_m)$ of the vertex set of a graph $G$, an {\em independent transversal} (IT) is an independent set in $G$ that contains one vertex from each $V_i$. A {\em fractional IT} is a non-negative real valued function on $V(G)$ that represents each part with total weight at least $1$, and belongs as a vector to the convex hull of the incidence vectors of independent sets in the graph. It is known that if the domination number of the graph induced on the union of every $k$ parts $V_i$ is at least $k$, then there is a fractional IT. We prove a weighted version of this result. This is a special case of a general conjecture, on the weighted version of a duality phenomenon, between independence and domination in pairs of graphs.

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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