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document
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Sheikh, A.H. (author), Lahaye, D. (author), Vuik, C. (author)
A Helmholtz solver whose convergence is parameter independent can be obtained by combining the shifted Laplace preconditioner with multigrid deflation. To proof this claim, we develop a Fourier analysis of a two-level variant of the algorithm proposed in [1]. In this algorithm those eigenvalues that prevent the shifted Laplace preconditioner...
report 2011
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document
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Sheikh, A.H. (author), Vuik, C. (author), Lahaye, D. (author) report 2009
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