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arXiv 2407.00792math.NAcs.NA
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关于可变 Toeplitz 矩阵与矩阵序列的特征值和奇异值的一个注记,并应用于抛物型方程的可变两步 BDF 逼近

A note on eigenvalues and singular values of variable Toeplitz matrices and matrix-sequences, with application to variable two-step BDF approximations to parabolic equations

Nikos Barakitis, Valerio Loi, Stefano Serra-Capizzano

AI总结:

本文利用广义局部 Toeplitz(GLT)理论分析可变 Toeplitz/BDF 矩阵序列在非均匀网格上的特征值与奇异值渐近行为,并给出符号、数值示例与开放问题。

摘要:

本文考虑一类更一般的矩阵序列,并证明它们属于广义局部 Toeplitz(GLT)矩阵序列的极大 $*$-代数。随后,我们在一般情形和具体情形中识别相应的 GLT 符号与 GLT 瞬时符号,并在两种情况下均给出谱分析和奇异值分析。更具体地说,我们使用 GLT 工具,结合给定的非均匀网格,研究所考虑的 BDF 矩阵序列的特征值和奇异值的渐近行为。数值示例、可视化结果和开放问题构成本文的结尾。

英文摘要:

Here, we consider a more general class of matrix-sequences and we prove that they belong to the maximal $*$-algebra of generalized locally Toeplitz (GLT) matrix-sequences. Then, we identify the associated GLT symbols and GLT momentary symbols in the general setting and in the specific case, by providing in both cases a spectral and singular value analysis. More specifically, we use the GLT tools in order to study the asymptotic behaviour of the eigenvalues and singular values of the considered BDF matrix-sequences, in connection with the given non-uniform grids. Numerical examples, visualizations, and open problems end the present work.

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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