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Showing 1 to 1 of 1 for “"nonsymmetric saddle point matrix"”.
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A Modified Preconditioned Conjugate Gradient Method for Approximating the Scattering Amplitude
… derive a conjugate gradient-like iteration for a nonsymmetric saddle point matrix that is constructed to have a real positive spectrum. We investigate the use of Schur Complement preconditioners with block-diagonal factorization to speed up the convergence of our method and compare the results to …