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arXiv 0905.2823math.CO
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雪崩多项式

Avalanche polynomials

Robert Cori, Anne Micheli, Dominique Rossin

摘要:

图上的雪崩多项式描述了阿贝尔沙堆模型中雪崩的分布。在树的研究中,这个多项式可以通过简单地考虑原始树的子树的大小来定义。本文研究了平面树上这类多项式的一些性质。以前已经证明,两棵不同的树可以有相同的雪崩多项式。我们在这里表明,找到一个指定的多项式树的问题是NP-完全的。第二部分研究了树上雪崩分布的均值和方差,并给出了一个闭公式。

英文摘要:

The avalanche polynomial on a graph captures the distribution of avalanches in the abelian sandpile model. Studied on trees, this polynomial could be defined by simply considering the size of the subtrees of the original tree. In this article, we study some properties of this polynomial on plane trees. Previously it has been proved that two different trees could have the same avalanche polynomial. We show here that the problem of finding a tree with a prescribed polynomial is NP-complete. In a second part, we study the average and the variance of the avalanche distribution on trees and give a closed formula.

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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