Essentially hyponormal operators with essential spectrum contained in a circle
In this paper two results are given . It is proved that if the essential spectrum <em>σ(π(T))</em> of the bounded hyponormal operator <em>T</em> is contained in a circle, then <em>T</em> is essentially normal operator. Based on this result it is proved that if <...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Università degli Studi di Catania
2009-05-01
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| Series: | Le Matematiche |
| Subjects: | |
| Online Access: | http://www.dmi.unict.it/ojs/index.php/lematematiche/article/view/246 |