Abstract
We study the asymptotic behaviour of the eigenvalues of Hermitiann×n block Topelitz matricesT n , withk×k blocks, asn tends to infinity. No hypothesis is made concerning the structure of the blocks. Such matrices{T n } are generated by the Fourier coefficients of a Hermitian matrix valued functionf∈L 2, and we study the distribution of their eigenvalues for largen, relating their behaviour to some properties of the functionf. We also study the eigenvalues of the preconditioned matrices{P −1n Tn}, where the sequence{P n } is generated by a positive definite matrix valued functionp. We show that the spectrum of anyP −1 n T n is contained in the interval [r, R], wherer is the smallest andR the largest eigenvalue ofp −1 f. We also prove that the firstm eigenvalues ofP −1n Tn tend tor and the lastm tend toR, for anym fixed. Finally, exact limit values for both the condition number and the conjugate gradient convergence factor for the preconditioned matricesP −1n Tn are computed.
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Miranda, M., Tilli, P. Block Toeplitz matrices and preconditioning. Calcolo 33, 79–86 (1996). https://doi.org/10.1007/BF02575709
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DOI: https://doi.org/10.1007/BF02575709