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MR1928398
(2003i:15024)
15A60
(15A04 47B49)
Li, Chi-Kwong; Šemrl, Peter; Soares, Graca Linear operators preserving the numerical range (radius) on triangular matrices. Linear preserver problems (Lisbon, 1999). Linear and Multilinear Algebra 48 (2001), no. 4, 281--292. |
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