Sub-direct sums and differences for certain matrix classes
Х. Д. Икрамов · Computational Mathematics and Mathematical Physics · 2010
The classes of accretive, dissipative, and accretive-dissipative matrices are shown to be closed with respect to taking a sub-direct sum, while the classes of SQD and BG matrices are closed with respect to taking a sub-direct difference. Computational consequences of these facts are discussed.