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Browsing by Subject "subnormal operator"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Spectra of subnormal pairs
    (2007) Rudol, Krzysztof
    In this short note we present an example related to joint spectra of subnormal pairs of bounded operators. A counterexample to the equality between Taylor's spectrum and the closure of the defect spectrum is given. This example is related to the author's modification of N Sibony's counterexample to Corona Theorem on domains that fail to be strictly pseudoconvex.