NUMERICAL TREATMENT OF INTEGRAL-EQUATIONS ON IPSC

One of the main drawbacks of the integral equations method applied to scattering problems is that, after discretization, this method leads t o a full complex and non-Hermitian matrix. Furthermore, as the mathema tical problem may be singular due to eigenvalues of the inside problem of diffraction, the matrix is usually ill-conditioned. In this paper, we study a preconditioning matrix from the point of view of efficienc y and parallelism.