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arXiv 1702.02650math.SP
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非负反本征值问题中的对角元

Diagonal elements in the Nonnegative Inverse Eigenvalue Problem

Richard Ellard, Helena Šmigoc

摘要:

我们说一个复数列表是“可实现的”,如果它是某个非负矩阵的谱。非负逆本征值问题(NIEP)是刻画所有可实现列表的问题。虽然NIEP仍然没有解决,它已经解决的情况下,在列表中的每个条目(除了Perron特征值)有非正的实部。对于一个给定的这种类型的频谱,我们表明,一个列表的非负数可能会出现的对角元素的实现矩阵的当且仅当这些数字满足一个非常简单的不等式。此外,我们表明,实现可以实现由一个友矩阵和一个对角矩阵。

英文摘要:

We say that a list of complex numbers is "realisable" if it is the spectrum of some (entrywise) nonnegative matrix. The Nonnegative Inverse Eigenvalue Problem (NIEP) is the problem of characterising all realisable lists. Although the NIEP remains unsolved, it has been solved in the case where every entry in the list (apart from the Perron eigenvalue) has nonpositive real part. For a given spectrum of this type, we show that a list of nonnegative numbers may arise as the diagonal elements of the realising matrix if and only if these numbers satisfy a remarkably simple inequality. Furthermore, we show that realisation can be achieved by the sum of a companion matrix and a diagonal matrix.

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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