Notes on the Taylor joint spectrum of commuting operators
R. Levi (1982)
Banach Center Publications
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R. Levi (1982)
Banach Center Publications
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L. Waelbroeck (1982)
Banach Center Publications
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Laura Burlando (1994)
Banach Center Publications
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This survey deals with necessary and/or sufficient conditions for continuity of the spectrum and spectral radius functions at a point of a Banach algebra.
Kjeld Bagger Laursen, Pavla Vrbová (1989)
Czechoslovak Mathematical Journal
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Enrico Casadio Tarabusi (1988)
Rendiconti del Seminario Matematico della Università di Padova
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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).
Takashi Ichinose (1982)
Banach Center Publications
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