作 者:
(杨国增);
(孔莹莹);
(曹小红);
机构地区:
郑州师范学院数学与统计学院,河南郑州450044
出 处:
《深圳大学学报(理工版)》
2017年第4期372-377,共6页
摘 要:
设H为无限维复可分的Hilbert空间,B(H)为H上的有界线性算子的全体.称T∈B(H)满足a-Weyl定理,若σ_a(T)\σ_(ea)(T)=π_(00)~a(T),其中,σ_a(T)和σ_(ea)(T)分别表示算子T∈B(H)的逼近点谱和本质逼近点谱,π_(00)~a(T)={λ∈isoσ_a(T)∶0
Let H be an infinite dimensional separable complex Hilbert space and B( H) be the algebra of all bounded linear operators on H. For T ∈ B( H),we call a-Weyl's theorem holds for T if σa( T) /σea( T) = π00^a( T),whereσa( T) and σea( T) denote the approximate point spectrum and essential approximate point spectrum respectively,and π00^a( T) = { λ ∈ isoσa( t) ∶ 0 dim N( T-λI) ∞ }. Using the new defined spectrum,we investigate a-Weyl's theorem for operator function. Meanwhile,we characterize the sufficient and necessary conditions for operator function satisfying a-Weyl's theorem if T is a hypercyclic operator.
关 键 词:
线性算子理论
定理
逼近点谱
亚循环算子
算子函数
算子
谱集
谱