上三角算子矩阵Browder定理稳定性的判定 |
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引用本文: | 陈丽,杜海霞. 上三角算子矩阵Browder定理稳定性的判定[J]. 数学的实践与认识, 2014, 0(8) |
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作者姓名: | 陈丽 杜海霞 |
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作者单位: | 郑州师范学院数学与统计学院; |
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基金项目: | 河南省自科技厅软科学研究计划项目(142400410188) |
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摘 要: | 用σ(T)和σ_w)分别表示算子T的谱与weyl谱,π_(00)(T)={λ∈isoσ(T),0dimN(T-λI)∞},若σ(T)σ_w(T)■π_(00)(T)成立,则就认为T满足Browder定理.主要研究了2×2上三角算子矩阵的Browder定理在紧摄动下的稳定性,并给出了判定稳定性的等价条件.
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关 键 词: | Browder定理 紧摄动 谱 |
The Stability of Weyl'S Theorem for the Upper Triangular Operator Matrices |
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Abstract: | If an operator T have σ(T)σ_w(T) C π00(T),then it is said to satisfy Browder's theorem,where σ(T) and σ_w(T) denote the spectrum and the essential weyl spectrum respectively,and π00(T) = {λ ε isoσ(T),0 < dim N(T—λI) < ∞}.In this note,we investigate the stability of the 2×2 upper triangular operator matrices of the Browder's theorem under compact perturbations. |
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Keywords: | Browder's theorem compact perturbations spectrum |
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