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Two conditions for subnormality of unbounded operators
Published online by Cambridge University Press: 04 June 2001
Extract
We give two new sufficient conditions for unbounded Hilbert space operators to be subnormal. The first assumes that the sequence //Tnf//2 on a suitable subset of the domain is completely monotonic, the second is similar to the one given by Lambert in [3] for bounded operators and involves the sequence of binomial expansion of the real part of the operator.
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- Research Article
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- 2001 Glasgow Mathematical Journal Trust