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qd block algorithm

Applied Numerical Mathematics, 2010
The authors consider the block \(qd\) algorithm for block tridiagonal positive definite symmetric matrices, where the blocks are \(\ell \times \ell\) matrices. It is shown that the eigenvalues \(\lambda_i^{(k)}\), \(k \in N\), of the first block on the block diagonal of the decomposition obtained in the \(k\)th step of the \(qd\) algorithm constitute ...
Draux, André, Sadik, Mohamed
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