Korean J. Math. Vol. 21 No. 1 (2013) pp.35-39
DOI: https://doi.org/10.11568/kjm.2013.21.1.35

CONTINUITY OF THE SPECTRUM ON (classA)*

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Jae Won Lee
In Ho Jeon

Abstract

Let (classA)* denotes the class of operators satisfying |T^2| ≥ |T*|^2. In this paper, we show that the spectrum is continuous on (classA)*.



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