Spectra and pseudospectra of the direct sum operators
Sigma Journal of Engineering and Natural Sciences 2020, Vol. 38, Issue 3, pp. 1251-1259; doi.org/10.62051/ytu.sigma-journal-of-engineering-and-natural-sciences-spectra-and-pseudospectra-of-the-direct-sum-operators
Abstract
In this paper, the relationships between spectrum and pseudospectrum of the direct sum of linear operators in the direct sum of Hilbert spaces and its coordinate operators have been researched. Also, the analogous relations of some numerical characteristics (spectral and pseudospectral radii) of such operators have been investigated.
Keywords: Direct sum of operators; spectrum; pseudospectrum; spectral radii.
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ISMAILOV, Z.I.; AL, P.I. Spectra and pseudospectra of the direct sum operators. Sigma Journal of Engineering and Natural Sciences 2020, Vol. 38, pp. 1251-1259. https://doi.org/10.62051/ytu.sigma-journal-of-engineering-and-natural-sciences-spectra-and-pseudospectra-of-the-direct-sum-operators
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