On matrix rearrangement inequalities
On matrix rearrangement inequalities
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关于矩阵重排不等式
DOI:
10.1090/proc/14831
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发表时间:
2020
影响因子:
1
通讯作者:
Steinerberger, Stefan
中科院分区:
文献类型:
--
作者:
Alaifari, Rima;Cheng, Xiuyuan;Pierce, Lillian B.;Steinerberger, Stefan
Given two symmetric and positive semidefinite square matrices, is it true that any matrix given as the product ofcopies ofandcopies ofin a particular sequence must be dominated in the spectral norm by the ordered matrix product? For example, is\begin {equation*}\| AABAABABB\|\leq\| AAAAABBBB\|?\end {equation*} Drury [Electron J. Linear Algebra 18 (2009), pp. 13–20] has characterized precisely which disordered words have the property that an inequality of this type holds for all matrices. However, the-parameter family of counterexamples Drury constructs for these characterizations is comprised ofmatrices, and thus as stated the characterization applies only formatrices with. In contrast, we prove that formatrices, the general rearrangement inequality holds for all disordered words. We also show that for largermatrices, the general rearrangement inequality holds for all disordered words for most(in a sense of full measure) that are sufficiently small perturbations of the identity. References
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