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AuthorXia, Daoxing. author
TitleSpectral Theory of Hyponormal Operators [electronic resource] / by Daoxing Xia
ImprintBasel : Birkhรคuser Basel : Imprint: Birkhรคuser, 1983
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Descript XIV, 242 p. online resource


Spectral analysis of linear operators has always been one of the more active and important fields of operator theory, and of extensive interest to many operator theorists. Its develยญ opments usually are closely related to certain important problems in contemporary mathematics and physics. In the last 20 years, many new theories and interesting results have been discovered. Now, in this direction, the fields are perhaps wider and deeper than ever. This book is devoted to the study of hyponormal and semi-hyponormal operators. The main results we shall present are those of the author and his collaborators and colleagues, as well as some concerning related topics. To some extent, hyponormal and semi-hyponormal operaยญ tors are "close" to normal ones. Although those two classes of operators contain normal operators as a subclass, what we are interested in are, naturally, nonnormal operators in those classes. With the well-studied normal operators in hand, we cerยญ tainly wish to know the properties of hyponormal and semi-hypoยญ normal operators which resemble those of normal operators. But more important than that, the investigations should be concenยญ trated on the phenomena which only occur in the nonnormal cases

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