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The essential selfcommutator of a subnormal operator
Author(s):
John
B.
Conway;
Nathan
S.
Feldman
Abstract | Similar articles | Additional information Abstract: In this paper an easier proof is obtained of Alexandru Aleman's extension of an inequality of Axler and Shapiro for subnormal operators to the essential norm. The method is applied to show that a hyponormal operator whose essential spectrum has area zero must be essentially normal.
Retrieve articles in Proceedings of the American Mathematical Society with MSC (1991): 47B20, 30E10 Retrieve articles in all Journals with MSC (1991): 47B20, 30E10
John
B.
Conway
Nathan
S.
Feldman
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