Local overlapping Schwarz smoothers are shown to lose multigrid smoothing quality as anisotropy increases, requiring blocks of size O(epsilon^{-1/2}) to remain robust.
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Overlapping Schwarz methods are not anisotropy-robust multigrid smoothers
Local overlapping Schwarz smoothers are shown to lose multigrid smoothing quality as anisotropy increases, requiring blocks of size O(epsilon^{-1/2}) to remain robust.