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The author wishes to thank his wife, D. W. Hadwin, J. Pejsachowicz and H. Salas for many helpful suggestions.
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Herrero, D.A. Closure of similarity orbits of Hilbert space operators. III. Math. Ann. 232, 195–204 (1978). https://doi.org/10.1007/BF01351426
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DOI: https://doi.org/10.1007/BF01351426