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An Approximate Direct Inverse as a Preconditioner for Ill-conditioned Problems

Lee, Chung H.; Lee, Jin F.; Langston, William L.; Zinser, Brian; Dang, Vinh Q.; Huang, Andy H.; Campione, Salvatore

This paper implemented an approximate direct inverse for the surface integral equation including multilevel fast-multipole method. We apply it as a preconditioner to two examples suffering convergence problem with an iterative solver.