The boundary of higher rank numerical ranges

Linear Algebra and Its Applications - Tập 435 - Trang 2971-2985 - 2011
Mao-Ting Chien1, Hiroshi Nakazato2
1Department of Mathematics, Soochow University, Taipei 11102, Taiwan
2Department of Mathematical Sciences, Faculty of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan

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