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arXiv 2108.09502math.NAcs.NA
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三阶张量T-特征值的扰动分析

Perturbation analysis on T-eigenvalues of third-order tensors

Changxin Mo, Weiyang Ding, Yimin Wei

AI总结:

该研究针对三阶张量T-特征值的扰动问题,推广多个经典矩阵定理,提出张量ε-伪谱的等价定义与性质,并通过数值算例实现伪谱可视化。

摘要:

扰动分析已成为多学科领域的重要研究问题,且已取得显著进展,尤其在矩阵领域成果突出。本研究聚焦张量-张量乘法背景下张量T-特征值的相关特定问题。首先,本文引入解析扰动分析方法,探究T-特征值的敏感性。针对前切片为方阵的三阶张量,我们推广了经典的Gershgorin圆盘定理,证明所有T-特征值都位于Gershgorin圆盘的并集内。此外,我们将Bauer-Fike定理推广至F-可对角化张量,并提出两种适用于更一般场景的修正版本。本文还研究了Kahan定理的张量情形,该定理针对Hermite张量的一般扰动问题。进一步地,我们基于张量-张量乘法提出了三阶张量的伪谱概念,给出了在谱范数下等价的四种定义来刻画张量ε-伪谱,并推导了若干伪谱性质。为实现可视化,本文还提供了若干数值算例,展示特定张量在不同水平下的ε-伪谱。

英文摘要:

Perturbation analysis has emerged as a significant concern across multiple disciplines, with notable advancements being achieved, particularly in the realm of matrices. This study centers on specific aspects pertaining to tensor T-eigenvalues within the context of the tensor-tensor multiplication. Initially, an analytical perturbation analysis is introduced to explore the sensitivity of T-eigenvalues. In the case of third-order tensors featuring square frontal slices, we extend the classical Gershgorin disc theorem and show that all T-eigenvalues are located inside a union of Gershgorin discs. Additionally, we extend the Bauer-Fike theorem to encompass F-diagonalizable tensors and present two modified versions applicable to more general scenarios. The tensor case of the Kahan theorem, which accounts for general perturbations on Hermite tensors, is also investigated. Furthermore, we propose the concept of pseudospectra for third-order tensors based on tensor-tensor multiplication. We develop four definitions that are equivalent under the spectral norm to characterize tensor $\varepsilon$-pseudospectra. Additionally, we present several pseudospectral properties. To provide visualizations, several numerical examples are also provided to illustrate the $\varepsilon$-pseudospectra of specific tensors at different levels.

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