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两个正交投影算子组合的性质

Properties of the combination of two orthogonal projectors
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摘要 研究了两个正交投影算子P和Q的组合aP+bQ+cPQ的谱和秩的性质.用矩阵的CS-分解分别刻画了两个正交投影算子的组合aP+bQ+cPQ是EP阵,可对角化矩阵,幂零矩阵,幂等矩阵的特征.分别给出了两个正交投影算子P和Q的组合aP+bQ+cPQ是三幂等矩阵,对合矩阵的完全刻画. The spectral and rank properties of the linear combination of two orthogonal projectors are researched.The CS-decomposition of the matrix is used to characterize this linear combination when it is a EP matrix,diagonalizable,nilpotent,idempotent.The complete characterizations are presented for this linear combination when it is tripotent,involutive.
作者 蒋万林 左可正 李昱 JIANG Wanlin;ZUO Kezheng;LI Yu(College of Mathematics and Statistics, Hubei Normal University, Huangshi, Hubei 435002, China)
出处 《华中师范大学学报(自然科学版)》 CAS CSCD 北大核心 2021年第3期356-364,共9页 Journal of Central China Normal University:Natural Sciences
基金 国家自然科学基金项目(11961076).
关键词 正交投影算子 CS-分解 orthogonal projectors CS-decomposition spectral rank
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