...indefinite.
By ``very indefinite,'' we mean that the matrix has many negative and many positive eigenvalues.

...matrices.
Two possible exceptions to this recommendation are (1) if the matrix has no or very small cliques and identical nodes (in which case the factorization may be very slow) and (2) if the space for the incomplete factorization is not available.

...number.
It is important to note that this routine will be called by a processor for only those global row numbers that are local to that processor or for those global row numbers that are connected in the sparse matrix to rows that are local to that processor.

sgreen@cs.utk.edu