PINVITPreconditioned Inverse Iteration
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PINVIT is interpreted in [44, 45] as a perturbation of the classical inverse iterations.
* the estimates for the Ritz values are individually sharp for the most basic PINVIT scheme; see [37] for details,
Numerical comparison of PINVIT, PSD and LOBPCG according to [34, 35, 36] demonstrates, however, that the LOBPCG method is much faster in practice.