Approximate Inverse Preconditioning of Iterative
                   Methods for Nonsymmetric Linear Systems

                                  M. Benzi 
                           CERFACS, Toulouse France

                                     and

                                   M. Tuma
            Institute of Computer Science, Prague, Czech Republic

                                   Abstract

A method for computing an incomplete factorization of the inverse of a
nonsymmetric matrix A is presented.  The resulting factorized sparse
approximate inverse is used as a preconditioner in the iterative solution of
Ax=b by Krylov subspace methods.