我们证明了以下结论:(1)若T是拟-*-A(n)算子,则T是似正规算子.(2)若E是拟-*-A(n)算子T的非零孤立谱点λ的Riesz幂等算子,则E是自共轭的且满足R(E)=N(T-λ)=N(T-λ)*.(3)若T或T~*是代数拟-*-A(n)算子,则f(T)满足Weyl定理.(4)若T~*是代数拟-*-A(n)算子,则f(T)满足α-Weyl定理,其中f∈H(σ(T)).
We prove the following assertions: (1) If T is a quasi-*-A(n) operator, then T is normaloid. (2) if E is the Riesz idempotent for a non-zero isolated point of the spectrum of a quasi-λ-A(n) operator T, then E is self-adjoint and R(E) = N(T - λ) = N(T - λ)*. (3) If T or T* is an algebraically quasi-λ-A(n) operator, then Weyl's theorem holds for f(T) for every f E H(a(T)). (4) If T* is an algebraically quasi-λ-A(n) operator, then a-Weyl's theorem holds for f(T) for every f E H∈(T)).