Fredholm and Local Spectral Theory, with Applications to Multipliers
A signi?cant sector of the development of spectral theory outside the classical area of Hilbert space may be found amongst at multipliers de?ned on a complex commutative Banach algebra A. Although the general theory of multipliers for abstract Banach algebras has been widely investigated by several authors, it is surprising how rarely various aspects of the spectral theory, for instance Fredholm theory and Riesz theory, of these important classes of operators have been studied. This scarce consideration is even more surprising when one observes that the various aspects of spectral t- ory mentioned above are quite similar to those of a normal operator de?ned on a complex Hilbert space. In the last ten years the knowledge of the spectral properties of multip- ers of Banach algebras has increased considerably, thanks to the researches undertaken by many people working in local spectral theory and Fredholm theory. This research activity recently culminated with the publication of the book of Laursen and Neumann , which collects almost every thing that is known about the spectral theory of multipliers.
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A G C aap(T Abelian group Aiena analytic function arbitrary assume Banach space bounded operator characterization classes of operators Clearly closed subset closed subspace commutative Banach algebra commutative semi-simple compact Abelian group compact operator complemented conclude consequence Conversely convolution operator Corollary cr(T decomposable defined denote element equality essentially semi-regular Example exists finite finite-dimensional Fredholm operator Fredholm theory group algebra idempotent Imp(X implies improjective inclusion indecomposable inessential operators injective invertible isolated point isomorphism ker XI kerT Laursen and Neumann Lemma Let T G L(X Let us consider linear Moreover Mq(A multiplication operator multiplier multiplier algebra obtain orthogonal Proof Suppose prove psoc quasi-nilpotent regular result Riesz algebra Riesz operator semi-Fredholm operators semi-prime Banach algebra semi-simple Banach algebra semi-simple commutative Banach sequence socle spectral subspaces spectrum subalgebra super-decomposable surjective SVEP T G M(A T-invariant theorem holds Weyl's theorem whilst
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