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Linear operators preserving the numerical range (radius) on triangular matrices |
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| Authors: | Chi-Kwong Li Peter &#x emrl Graca Soares |
| Institution: | Chi-Kwong Li ,Peter Š,emrl,Graca Soares |
| Abstract: | We characterize those linear operators on triangular or diagonal matrices preserving the numerical range or radius. |
| Keywords: | Linear operator Triangular matrices Numerical range (radius) AMS Subject Classifications (1991): 15A60 15A04 47A49 |
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