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Spectral pictures of and
Authors:Robin Harte  Young Ok Kim  Woo Young Lee
Institution:School of Mathematics, Trinity College, Dublin, Ireland ; Department of Mathematics, Seoul National University, Seoul 151-742, Korea ; Department of Mathematics, Seoul National University, Seoul 151-742, Korea
Abstract:The spectral pictures of products $AB$ and $BA$ of Banach space operators are compared; in particular when one of them is `of index zero'.

Keywords:Spectral pictures  index zero  quasitriangular  essentially normal operators  compalent  generalized Aluthge transforms
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