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arXiv 2409.09442math.NAcs.NA
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对称半正定系统两网格方法的收敛性分析

Convergence analysis of two-grid methods for symmetric positive semidefinite systems

School of Mathematics, Southeast University(东南大学数学学院)

Xuefeng Xu

AI总结:

本文提出了一种无需额外假设的两网格方法收敛性分析框架,用于对称半正定系统,通过Moore-Penrose逆和近似粗解算子推导收敛因子和估计。

摘要:

两网格理论在多网格方法的设计和分析中起着基础性作用。本文致力于对奇异和对称半正定系统中两网格方法的新型收敛性分析。具体来说,我们推导了一个简洁的恒等式,用于表征两网格方法的收敛因子,其中使用粗网格矩阵的Moore-Penrose逆作为粗解算子。此外,我们还给出了使用近似粗解算子的两网格方法的收敛估计。我们的新理论不需要对系数矩阵做任何额外的假设,特别是对其空域。

英文摘要:

Two-grid theory plays a fundamental role in the design and analysis of multigrid methods. This paper is devoted to a new convergence analysis of two-grid methods for singular and symmetric positive semidefinite systems. Specifically, we derive a concise identity for characterizing the convergence factor of two-grid methods, with the Moore--Penrose inverse of coarse-grid matrix being used as a coarse solver. Furthermore, we present a convergence estimate for two-grid methods with approximate coarse solvers. Our new theory does not require any additional assumptions on the coefficient matrix, especially on its null space.

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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