Findings on H- and H2-based methods for integral-equation-based electrically large analysis

The H- and H²-based methods with a minimal-rank representation and an optimized H-partition have been recently developed for large-scale electrodynamic analysis. In this paper, we report a few important findings that help advance our traditional understandings of the H- and H²-based methods for electrically large analysis. These findings can also be used to accelerate other fast solvers for dense matrix computations.