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 
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     title = {The spectral radii of an operator and its modulus},
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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/