Geodesic
The spectral radii of an operator and its modulus
Commentationes Mathematicae Universitatis Carolinae, Tome 17 (1976) no. 2, pp. 273-279

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Classification : 15A18, 15A42, 15A60, 47A10, 47B15 
Pták, Vlastimil. The spectral radii of an operator and its modulus. Commentationes Mathematicae Universitatis Carolinae, Tome 17 (1976) no. 2, pp. 273-279. http://geodesic.mathdoc.fr/item/CMUC_1976_17_2_a5/
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     zbl = {0332.15003},
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     url = {http://geodesic.mathdoc.fr/item/CMUC_1976_17_2_a5/}
}
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[1] DANIEL J. W., PALMER T. W.: On $\sigma (T), \|T\| and \|T^{-1}\|$. Linear Algebra and its Applications 2 (1969), 381-386. | MR | Zbl

[2] YOUNG N. J.: Analytic programmes in matrix algebras. (in print). | Zbl