S-essential spectra and the Weyl pseudospectra of linear operators

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November 2015



In this work we present a spectral study of semi regular operator. The concept of semi regularity and essentially semi regularity amongst the various concepts of regularity originating from Fredholm theory, and we introduce new notions and unprecedented denition to develop pseudospectral theory. We built our denition on the basis of essential spectra and tried to comply it with pseudospectral theory. So, we intend to obtain what we call "Weyl pseudospectra".


Dr Aymen Ammar is an assistant professor of mathematics at the Faculty of Science in Sfax (Tunisia). His research focuses on functional analysis, specially spectral and multivalued linear operators.
EAN: 9783659681127
ISBN: 3659681121
Untertitel: Paperback. Sprache: Englisch.
Verlag: LAP Lambert Academic Publishing
Erscheinungsdatum: November 2015
Seitenanzahl: 132 Seiten
Format: kartoniert
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