Transformations, Secondary Iterations, Incomplete Triangular Decompositions
To describe the variety of iterative methods applied nowadays, one needs further techniques producing new iterations from already known ones or introducing new features. Techniques of the former kind are the transformations described in §§8.1–3 and the composed methods from §8.4 generated by a secondary iteration, whereas the ILU decomposition from §8.5 is of the latter kind, since it produces a new method.
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