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The Rayleigh-Ritz method is widely used for eigenvalue approximation. Given a matrix X with columns that form an orthonormal basis for a subspace X , and a Hermitian matrix A, the eigenvalues of X H AX are called Ritz values of A with respect to X. If the subspace X is A-invariant then the Ritz values are some of the eigenvalues of A. If the A-invariant(More)
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