科研之友
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摘要
We obtain the following: (i) a new, coordinate-free characterization of quasidiagonal operators with essential spectra contained in the unit circle by adapting the proof of a classical result in the theory of Banach spaces, (ii) affirmative answers to some questions of Hadwin (iii) an alternative proof of Hadwin's characterization of the SOT, WOT, and *-SOT closure of the unitary orbit of a given operator on a separable, infinite-dimensional, complex Hilbert space.
- 出版日期2015
