How to prove that a preconditioner cannot be superlinear

Serra Capizzano, S.; Tyrtyshnikov, E.

doi:10.1090/S0025-5718-03-01506-0

How to prove that a preconditioner cannot be superlinear
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by S. Serra Capizzano and E. Tyrtyshnikov PDF

Math. Comp. 72 (2003), 1305-1316 Request permission

Abstract:

In the general case of multilevel Toeplitz matrices, we recently proved that any multilevel circulant preconditioner is not superlinear (a cluster it may provide cannot be proper). The proof was based on the concept of quasi-equimodular matrices, although this concept does not apply, for example, to the sine-transform matrices. In this paper, with a new concept of partially equimodular matrices, we cover all trigonometric matrix algebras widely used in the literature. We propose a technique for proving the non-superlinearity of certain frequently used preconditioners for some representative sample multilevel matrices. At the same time, we show that these preconditioners are, in a certain sense, the best among the sublinear preconditioners (with only a general cluster) for multilevel Toeplitz matrices.

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