on the essential numerical spectrum of operators on banach spaces

Nedra Moalla, Bouthaina Abdelhadi, Wissal Boubaker

Abstract


The purpose of this paper is to dene and develop a new notion of the essential
numerical spectrum  \sima_{en}(.) of an operator on a Banach space X and to study its properties.
Our denition is closely related to the essential numerical range We(.).


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