Opuscula Mathematica

Opuscula Math.
 27
, no. 2
 (), 301-304
Opuscula Mathematica

Spectra of subnormal pairs


Abstract. 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.
Keywords: subnormal operator, corona, joint spectrum.
Mathematics Subject Classification: 47B20, 46J15.
Cite this article as:
Krzysztof Rudol, Spectra of subnormal pairs, Opuscula Math. 27, no. 2 (2007), 301-304
 
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ISSN 1232−9274, e-ISSN 2300−6919, DOI https://doi.org/10.7494/OpMath
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