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We call T C B(H) consistent in Fredholm and index (briefly a CFI operator) if for each B ∈ B(H), TB and BT are Fredholm together and the same index of B, or not Fredholm together. Using a new spectrum defined in view of the CFI operator, we give the equivalence of Weyl's theorem and property (ω) for T and its conjugate operator T^*. In addition, the property (ω) for operator matrices is considered. 相似文献
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利用一致可逆性质和一致Fredholm指标性质定义了两个新谱集,通过这两个谱集与其他谱集之间的关系,分别对(ω1)性质、(ω)性质及其等价关系进行判定,同时对这两个谱集之间的等价性也进行了研究. 相似文献
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