Geodesic
On spectrum of some classes of matrix operators
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 2, pp. 3-6

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The paper is devoted to investigation of the spectrum of some classes of matrix operators. The relations between the parts of the spectrum of the matrix operators with corresponding parts of its elements are established. 
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M. I. Ismailov. On spectrum of some classes of matrix operators. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 2, pp. 3-6. http://geodesic.mathdoc.fr/item/ISU_2012_12_2_a0/