Gustafson, weidman, kato, wolf, schechter, browder, Rakočević and Schmoeger essential spectra of the sum of two bounded operators and application to a transport operator

• Autores: Aref Jeribi, Ines Walha
• Localización: Mathematische Nachrichten, ISSN 0025-584X, Vol. 284, Nº. 1, 2011, págs. 67-86
• Idioma: inglés
• DOI: 10.1002/mana.200710131
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• Resumen

  • 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 semi-Fredholm perturbations. Furthermore, we give an application to a transport operator.