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arXiv 1105.2677math.CO
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定向、格多面体和群排列II:图的模流多项式和积分流多项式

Orientations, lattice polytopes, and group arrangements II: Modular and integral flow polynomials of graphs

Beifang Chen

摘要:

利用子群排列和格多面体的方法研究了图的模流多项式和整流多项式。我们引入了欧拉等价关系的方向,流安排,和流多面体,我们应用Ehrhart多项式的理论,以获得模块化和积分流多项式的性质。重点是通过子群安排和Ehrhart多项式的几何处理。这一观点导出了模流多项式的一个互易律,给出了模流多项式在负整数上的值的解释,回答了Beck和Zaslavsky的一个问题.

英文摘要:

We study modular and integral flow polynomials of graphs by means of subgroup arrangements and lattice polytopes. We introduce an Eulerian equivalence relation on orientations, flow arrangements, and flow polytopes; and we apply the theory of Ehrhart polynomials to obtain properties of modular and integral flow polynomials. The emphasis is on the geometrical treatment through subgroup arrangements and Ehrhart polynomials. Such viewpoint leads to a reciprocity law for the modular flow polynomial, which gives rise to an interpretation on the values of the modular flow polynomial at negative integers, and answers a question by Beck and Zaslavsky.

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