East Asian mathematical journal
- Volume 16 Issue 1
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- Pages.49-55
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- 2000
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- 1226-6973(pISSN)
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- 2287-2833(eISSN)
CONDITIONS IMPLYING NORMALITY
Abstract
In this paper we find some classes of operators implying normaity. The main result is as follows. If T is restriction-convexoid and is reduced by each of its eigenspaces corresponding to isolated eigenvalues, which is a class including hyponormal operators, and if