- Sigma Mühendislik ve Fen Bilimleri Dergisi
- Vol: 38 Issue: 3
- SPECTRA AND PSEUDOSPECTRA OF THE DIRECT SUM OPERATORS
SPECTRA AND PSEUDOSPECTRA OF THE DIRECT SUM OPERATORS
Authors : Zameddin I. Ismailov, Pembe Ipek Al
Pages : 1251-1259
View : 7 | Download : 3
Publication Date : 2021-10-05
Article Type : Research
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