arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.07722math.CO
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方向超图:平衡性

Oriented Hypergraphs: Balanceability

Lucas J. Rusnak, Selena Li, Brian Xu, Eric Yan, Shirley Zhu

摘要:

定向超图是一种定向关联结构,它扩展了符号图、平衡超图和平衡矩阵的概念。我们介绍超图的结构和技术,推广的电路分类的符号图形框架拟阵的任何定向超图关联矩阵,通过其局部符号图形的子结构。为了实现这一点,Camion的算法被应用到定向超图,以提供一个泛化的重定向集和挫折,只有平衡定向超图定义良好。一个简单的不平衡电路的部分特征扩展到可表示拟阵的应用,证明了Fano和非Fano拟阵之间的差异是平衡之一。

英文摘要:

An oriented hypergraph is an oriented incidence structure that extends the concepts of signed graphs, balanced hypergraphs, and balanced matrices. We introduce hypergraphic structures and techniques that generalize the circuit classification of the signed graphic frame matroid to any oriented hypergraphic incidence matrix via its locally-signed-graphic substructure. To achieve this, Camion's algorithm is applied to oriented hypergraphs to provide a generalization of reorientation sets and frustration that is only well-defined on balanceable oriented hypergraphs. A simple partial characterization of unbalanceable circuits extends the applications to representable matroids demonstrating that the difference between the Fano and non-Fano matroids is one of balance.

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