Spectra and Pseudospectra of the Direct Sum Operators

İsmailov Z., İpek Al P.

SIGMA JOURNAL OF ENGINEERING AND NATURAL SCIENCES, cilt.38, ss.1251-1259, 2020 (ESCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 38
  • Basım Tarihi: 2020
  • Dergi Adı: SIGMA JOURNAL OF ENGINEERING AND NATURAL SCIENCES
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Academic Search Premier, Directory of Open Access Journals
  • Sayfa Sayıları: ss.1251-1259
  • Anahtar Kelimeler: Direct sum of operators, spectrum, pseudospectrum, spectral radii
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

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.