In this paper, we investigate the Gustafson, Weidmann, Kato, Wolf, Schechter and Browder essential spectra of a 2Γ2 block matrix operator defined on a Banach space where entries are unbounded operators between Banach spaces and with domains consisting of vectors satisfying certain relations between
On a characterization of the essential spectra of some matrix operators and application to two-group transport operators
β Scribed by Salma Charfi; Aref Jeribi
- Publisher
- Springer-Verlag
- Year
- 2008
- Tongue
- French
- Weight
- 274 KB
- Volume
- 262
- Category
- Article
- ISSN
- 0025-5874
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π SIMILAR VOLUMES
This paper is devoted to the investigation of the essential approximate point spectrum and the essential defect spectrum of a 2 Γ 2 block operator matrix on a product of Banach spaces. The obtained results are applied to a two-group transport operators with general boundary conditions in the Banach
## Abstract In this paper we investigate the essential spectra of the sum of two bounded linear operators defined on a Banach space by means of the essential spectra of each of the two operators where their products are Fredholm or semiβFredholm perturbations. Furthermore, we give an application to