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...Ieee transactions on microwave theory and techniques vol no january accuracy directly controlled fast direct solution of general h matrices its application to solving electrodynamic volume integral equations miaomiao ma graduate student member dan jiao fellow abstract the dense matrix resulting from an equa solvers for electromagnetic analysis many existing tion ie based maxwell s can be compactly interpreted in this framework although their represented by given a developments may predate exam prevailing solutions involve approximations ple structure well known whose only indirectly paper fmm basedmethods is other words we propose new algorithms including both factorization inversion viewed as algebraic generalization different recursive method multiplying vector inverse performed has complexity o nlogn electrically large one way traversal cluster tree surface sies mathematical litera leaf level all up root underlying ture such it shown that storage multiplications additions are carrie...