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arXiv 2102.03066math.APcs.NAmath.NA
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带边界条件的双曲型方程的finite difference逼近的锐稳定性

Sharp stability for finite difference approximations of hyperbolic equations with boundary conditions

Jean-François Coulombel, Grégory Faye

摘要:

本文考虑一类在单位圆上具有单特征值的Toeplitz算子的有限秩扰动。在对本质谱的性质作适当的假设下,我们证明了这类算子是幂有界的。这个问题起源于用有限差分格式逼近带边界条件的双曲型偏微分方程。我们的结果对Trefethen、Kreiss和Wu的猜想给出了肯定的回答,即只有所谓的一致Kreiss-Lopatinskii条件的弱形式才足以暗示幂有界性。

英文摘要:

In this article, we consider a class of finite rank perturbations of Toeplitz operators that have simple eigenvalues on the unit circle. Under a suitable assumption on the behavior of the essential spectrum, we show that such operators are power bounded. The problem originates in the approximation of hyperbolic partial differential equations with boundary conditions by means of finite difference schemes. Our result gives a positive answer to a conjecture by Trefethen, Kreiss and Wu that only a weak form of the so-called Uniform Kreiss-Lopatinskii Condition is sufficient to imply power boundedness.

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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