On isolated points of the approximate point spectrum of a closed linear relation

• Melik Lajnef ^[1] ; Maher Mnif ^[1]
  1. [1] University of Sfax

     University of Sfax

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• Localización: Extracta mathematicae, ISSN-e 0213-8743, Vol. 37, Nº 1, 2022, págs. 75-90
• Idioma: inglés
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• Resumen

  • We investigate in this paper the isolated points of the approximate point spectrum of a closed linear relation acting on a complex Banach space by using the concepts of quasinilpotent part and the analytic core of a linear relation.