Some remarks on the spectra and numerical range

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Some remarks on the spectra and numerical range. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 9 (1968), issue 4, pp. 527-531

MSC: 47-30, 47Axx | MR 0246147 | Zbl 0174.44304

References:

[1] S. BERBERIAN: A note on operators unitarily... Journ. London Math. Soc. 37 (1962), 403-404. MR 0141996 | Zbl 0111.30901

[2] V. ISTRĂTESCU: A note on hyponormal operators. (to appear, Indian Math. Journ.). MR 0279619

[3] G. ORLAND: On a class of operators. Proc. Amer. Math. Soc. 15 (1964), 75-79. MR 0157244 | Zbl 0123.31601

[4] T. SAITO, T. YOSHINO: On a conjecture of Berberian. Tohoku Math. J. 17 (1965), 147-149. MR 0187093 | Zbl 0132.35703

[5] I. H. SHETH: On hyponormal operators. Proc. Amer. Math, Soc. 17 (1966), 998-1000. MR 0196498 | Zbl 0148.38403

[6] I. H. SHETH: On normaloid operators. (to appear). MR 0240662 | Zbl 0174.44303

[7] J. STAMPFLI, J. WILLIAMS: Growth conditions and the numerical range in a Banach algebra. (to appear). MR 0243352

[8] J. WILLIAMS: Spectra of products and numerical range. Journ. Math. Anal. App. 17 (2) (1967). MR 0203491

[9] J. WILLIAMS: Operators similar to their adjoints. (to appear). MR 0233230 | Zbl 0165.15002

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