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arXiv 2602.12121math.NAcs.NAmath.OC
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三阶张量的低T-相阶近似

Low T-Phase Rank Approximation of Third Order Tensors

Kyungpook National University(庆北国立大学);Fudan University(复旦大学)

Taehyeong Kim, Hayoung Choi, Yimin Wei

AI总结:

本文提出了一种基于张量T乘积的三阶张量低T-相阶近似方法,通过引入规范T-相和T-相阶,推导了张量相主化不等式,并在正虚部领域得到了最优解的显式公式及MIMO系统的相定理。

摘要:

我们研究了在张量T乘积下,三阶张量$\mathscr{A}\in\mathbb{C}^{n\times n\times p}$的低T-相阶近似。我们引入了规范T-相和T-相阶,并将近似任务表述为在T-相阶约束下最小化一个对称度量的规范相向量。我们的主要工具是通过块循环表示提升矩阵不等式所获得的张量相主化不等式,用于几何均值。在正虚部领域,这给出了精确的最优值公式和显式的最优半相截断族。我们进一步建立了经典矩阵相不等式的张量对应物,并推导了MIMO线性时不变系统的张量小相定理。

英文摘要:

We study low T-phase-rank approximation of sectorial third-order tensors $\mathscr{A}\in\mathbb{C}^{n\times n\times p}$ under the tensor T-product. We introduce canonical T-phases and T-phase rank, and formulate the approximation task as minimizing a symmetric gauge of the canonical phase vector under a T-phase-rank constraint. Our main tool is a tensor phase-majorization inequality for the geometric mean, obtained by lifting the matrix inequality through the block-circulant representation. In the positive-imaginary regime, this yields an exact optimal-value formula and an explicit optimal half-phase truncation family. We further establish tensor counterparts of classical matrix phase inequalities and derive a tensor small phase theorem for MIMO linear time-invariant systems.

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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