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On the range of a hyponormal derivation. (English) Zbl 0315.47019


MSC:

47B20 Subnormal operators, hyponormal operators, etc.
47B06 Riesz operators; eigenvalue distributions; approximation numbers, \(s\)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators
16W20 Automorphisms and endomorphisms
47A10 Spectrum, resolvent
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References:

[1] Joel H. Anderson and C. Foia[ill], On the range of a derivation, Pacific J. Math. (to appear).
[2] J. G. Stampfli, Hyponormal operators and spectral density, Trans. Amer. Math. Soc. 117 (1965), 469 – 476. · Zbl 0139.31201
[3] Joseph G. Stampfli, Compact perturbations, normal eigenvalues and a problem of Salinas, J. London Math. Soc. (2) 9 (1974/75), 165 – 175. · Zbl 0305.47010 · doi:10.1112/jlms/s2-9.1.165
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