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arXiv 1009.0880math.OCmath.CO
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关于非负秩的几何解释

On the Geometric Interpretation of the Nonnegative Rank

Nicolas Gillis, François Glineur

摘要:

一个非负矩阵的非负秩是精确重构它所需的非负秩1因子的最小数目。确定这个秩和计算相应的非负因子的问题是困难的;然而它有许多潜在的应用,例如,数据挖掘、图论和计算几何学。特别是,它可以用来表征一个给定的组合优化程序的任何扩展重构的最小尺寸。本文引入并研究了一个相关的量,称之为限制非负秩。我们表明,计算这个数量是等价的多面体组合数学的问题,并充分表征其计算复杂性。这反过来又揭示了新的光的非负秩问题,特别是允许我们提供新的改进的下界的基础上,其几何解释。我们将这些结果应用于松弛矩阵和线性欧氏距离矩阵,并得到了Beasly和Laffey两个定理的反例,即证明了线性欧氏距离矩阵的非负秩不一定等于其维数,矩阵的秩不一定大于其平方的非负秩.

英文摘要:

The nonnegative rank of a nonnegative matrix is the minimum number of nonnegative rank-one factors needed to reconstruct it exactly. The problem of determining this rank and computing the corresponding nonnegative factors is difficult; however it has many potential applications, e.g., in data mining, graph theory and computational geometry. In particular, it can be used to characterize the minimal size of any extended reformulation of a given combinatorial optimization program. In this paper, we introduce and study a related quantity, called the restricted nonnegative rank. We show that computing this quantity is equivalent to a problem in polyhedral combinatorics, and fully characterize its computational complexity. This in turn sheds new light on the nonnegative rank problem, and in particular allows us to provide new improved lower bounds based on its geometric interpretation. We apply these results to slack matrices and linear Euclidean distance matrices and obtain counter-examples to two conjectures of Beasly and Laffey, namely we show that the nonnegative rank of linear Euclidean distance matrices is not necessarily equal to their dimension, and that the rank of a matrix is not always greater than the nonnegative rank of its square.

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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