A broad class of preconditioners is based on incomplete factorizations
of the coefficient matrix. We call a factorization incomplete if
during the factorization process certain *fill* elements,
nonzero elements in the factorization in positions where the original
matrix had a zero, have been
ignored. Such a preconditioner is then given in factored form
with lower and upper triangular. The efficacy of the
preconditioner depends on how well approximates .

- Creating an incomplete factorization
- Point incomplete factorizations
- Block factorization methods
- Blocking over systems of partial differential equations
- Incomplete LQ factorizations

Mon Nov 20 08:52:54 EST 1995