Geodesic
The Kato-type spectrum and local spectral theory
Czechoslovak Mathematical Journal, Tome 57 (2007) no. 3, pp. 831-842 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Let $T\in {\mathcal{L}}(X)$ be a bounded operator on a complex Banach space $X$. If $V$ is an open subset of the complex plane such that $\lambda -T$ is of Kato-type for each $\lambda \in V$, then the induced mapping $f(z)\mapsto (z-T)f(z)$ has closed range in the Fréchet space of analytic $X$-valued functions on $V$. Since semi-Fredholm operators are of Kato-type, this generalizes a result of Eschmeier on Fredholm operators and leads to a sharper estimate of Nagy’s spectral residuum of $T$. Our proof is elementary; in particular, we avoid the sheaf model of Eschmeier and Putinar and the theory of coherent analytic sheaves.
Let $T\in {\mathcal{L}}(X)$ be a bounded operator on a complex Banach space $X$. If $V$ is an open subset of the complex plane such that $\lambda -T$ is of Kato-type for each $\lambda \in V$, then the induced mapping $f(z)\mapsto (z-T)f(z)$ has closed range in the Fréchet space of analytic $X$-valued functions on $V$. Since semi-Fredholm operators are of Kato-type, this generalizes a result of Eschmeier on Fredholm operators and leads to a sharper estimate of Nagy’s spectral residuum of $T$. Our proof is elementary; in particular, we avoid the sheaf model of Eschmeier and Putinar and the theory of coherent analytic sheaves.
Classification : 47A11, 47A53
Keywords: decomposable operator; semi-Fredholm operator; semi-regular operator; Kato decomposition; Bishop’s property ($\beta $); property ($\delta $) 
@article{CMJ_2007_57_3_a3,
     author = {Miller, T. L. and Miller, V. G. and Neumann, M. M.},
     title = {The {Kato-type} spectrum and local spectral theory},
     journal = {Czechoslovak Mathematical Journal},
     pages = {831--842},
     year = {2007},
     volume = {57},
     number = {3},
     mrnumber = {2356283},
     zbl = {1174.47001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2007_57_3_a3/}
}
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Miller, T. L.; Miller, V. G.; Neumann, M. M. The Kato-type spectrum and local spectral theory. Czechoslovak Mathematical Journal, Tome 57 (2007) no. 3, pp. 831-842. http://geodesic.mathdoc.fr/item/CMJ_2007_57_3_a3/