Quasihyponormal operators and the continuity of the approximate point spectrum.
Djordjević, Slaviša V. (1997)
Matematichki Vesnik
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Djordjević, Slaviša V. (1997)
Matematichki Vesnik
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V. Rakočević (1985)
Matematički Vesnik
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I. Marek (1976)
Acta Universitatis Carolinae. Mathematica et Physica
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Catană, Petronela (2005)
Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică
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Gh. Constantin (1975)
Matematički Vesnik
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Lutz W. Weis (1986)
Extracta Mathematicae
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Andrzej Sołtysiak (1989)
Colloquium Mathematicae
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V. Kordula, V. Müller (1996)
Studia Mathematica
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There are a number of spectra studied in the literature which do not fit into the axiomatic theory of Żelazko. This paper is an attempt to give an axiomatic theory for these spectra, which, apart from the usual types of spectra, like one-sided, approximate point or essential spectra, include also the local spectra, the Browder spectrum and various versions of the Apostol spectrum (studied under various names, e.g. regular, semiregular or essentially semiregular).
Vladimír Müller (1993)
Studia Mathematica
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We investigate relations between the spectra defined by Słodkowski [14] and higher Shilov boundaries of the Taylor spectrum. The results generalize the well-known relation between the approximate point spectrum and the usual Shilov boundary.
Abdelmoumen, Boulbeba, Dehici, Abdelkader, Jeribi, Aref, Mnif, Maher (2008)
Journal of Inequalities and Applications [electronic only]
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W. Żelazko, Z. Słodkowski (1974)
Studia Mathematica
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