| RESEARCH ANNOUNCEMENTS On a Generalization of the c-numerical Range |
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| 作者姓名： | 雷天刚 邬晶华 |
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| 作者单位： | NationalNatural Science Foundation of China，Dept.ofMathematics，City University of Hong Kong Beijing，100085，P.R.China，Hong Kong，P.R.China |
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| 基金项目： | Direct Allocation Fund of City University of Hong Kong（Project No.71100118）. |
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| 摘 要： | Let Cn×n be the set of n×n complex matrices and (?)n the set of orthonormal n-tuples ofvectors in Cn.For a vector c in Cn and a matrix A in Cn×n,the c-numerical range of A is theset
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