Geodesic
Joint essential spectra
Czechoslovak Mathematical Journal, Tome 34 (1984) no. 4, pp. 598-603
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DOI : 10.21136/CMJ.1984.101985
Classification : 47A10, 47A53 
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Patel, A. B.; Vidyanagar, Vallabh. Joint essential spectra. Czechoslovak Mathematical Journal, Tome 34 (1984) no. 4, pp. 598-603. doi: 10.21136/CMJ.1984.101985

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[2] R. G. Douglas: Banach algebra techniques in operator theory. Acad. Press, 1972. | MR | Zbl

[3] P. A. Fillmore, J. G. Stampfli, J. P. Williams: On the essential numerical range, the essential spectrum and a problem of Halmos. Acta Sci. Math. Szegal, 33 (1972), 179-192. | MR | Zbl

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[5] T. Kato: Peturbation theory for linear operators. Springer Verlag, 1980.

[6] A. B. Patel: A joint spectral theorem for unbounded normal operators. J. Australian Math. Soc., (Series A) 34 (1983), 203-213. | DOI | MR | Zbl

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