Geodesic
Subdirect sums and differences for some classes of matrices
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 50 (2010) no. 1, pp. 10-15 
Kh. D. Ikramov. Subdirect sums and differences for some classes of matrices. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 50 (2010) no. 1, pp. 10-15. http://geodesic.mathdoc.fr/item/ZVMMF_2010_50_1_a1/
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Voir la notice de l'article provenant de la source Math-Net.Ru

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 $\mathrm{SQD}$ and $\mathrm{BG}$ matrices are closed with respect to taking a sub-direct difference. Computational consequences of these facts are discussed.

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