Spectral properties for polynomial and matrix operators involving demicompactness classes
The first aim of this paper is to show that a polynomially demicompact operator satisfying certain conditions is demicompact. Furthermore, we give a refinement of the Schmoëger and the Rakocević essential spectra of a closed linear operator involving the class of demicompact ones. The second aim...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Extremadura
2018-06-01
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| Series: | Extracta Mathematicae |
| Subjects: | |
| Online Access: | https://publicaciones.unex.es/index.php/EM/article/view/87 |