Abstract
We extend the Putnam-Fuglede theorem and the second-degree Putnam-Fuglede theorem to the nonnormal operators and to an elementary operator under perturbation by quasinilpotents. Some asymptotic results are also given.
Open Access
On the Putnam-Fuglede theorem
Received25 Nov 2003
Copyright
Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the
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