Incomplete blockwise factorizations of (block) H-matrices

@inproceedings{Polman1987IncompleteBF,
  title={Incomplete blockwise factorizations of (block) H-matrices},
  author={Ben Polman},
  year={1987}
}
The use of incomplete blockwise factorizations as preconditioners in conjugate gradient like methods has become more and more popular in recent years. Most of the theory concerning existence and applicability of these factorizations has been limited to M-matrices so far. Here we introduce a more general definition of block H-matrices (Robert [8]) and we extend the theory to this class of matrices. 

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