Preconditioners for non-Hermitian Toepli
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Raymond H. Chan; Daniel Potts; Gabriele Steidl
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Article
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2001
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John Wiley and Sons
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English
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In this paper, we construct new !-circulant preconditioners for non-Hermitian Toeplitz systems, where we allow the generating function of the sequence of Toeplitz matrices to have zeros on the unit circle. We prove that the eigenvalues of the preconditioned normal equation are clustered at 1 and tha