Abstract.
A sharp bound is obtained for the distance between two commuting tuples of normal operators in terms of the distance between their joint spectra.
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Received: 31.8.1997
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Bhatia, R., Elsner, L. & Šemrl, P. Distance between commuting tuples of normal operators. Arch. Math. 71, 229–232 (1998). https://doi.org/10.1007/s000130050257
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DOI: https://doi.org/10.1007/s000130050257