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Toeplitz projections and essential commutants

机译:托普利茨投影和基本换向

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We construct a Toeplitz projection for every regular A-Isometry T is an element of B(H)(n) on a complex Hilbert space H and use it to determine the essential commutant of the set of all analytic Toeplitz operators formed with respect to an essentially normal regular A-isometry. We show that the Toeplitz projection annihilates the compact operators if and only if T possesses no joint eigenvalues. As an application we deduce an essential version of the classical Hartman-Wintner spectral inclusion theorem, give a new proof of Johnson and Parrot's theorem on the essential commutant of abelian von Neumann algebras for separable Hilbert spaces and construct short exact sequences of Toeplitz algebras. (C) 2015 Elsevier Inc. All rights reserved.
机译:我们为每个规则的A等轴测构造Toeplitz投影T是复Hilbert空间H上B(H)(n)的元素,并用它来确定相对于a形成的所有解析Toeplitz算子的集合的必要交换。基本上是正常的A等轴测图。我们证明,当且仅当T不具有联合特征值时,Toeplitz投影才能消灭紧致算符。作为应用,我们推论出经典的Hartman-Wintner谱包含定理的基本形式,为可分离的Hilbert空间的阿贝尔冯·诺依曼代数的基本交换子给出了Johnson和Parrot定理的新证明,并构造了Toeplitz代数的短精确序列。 (C)2015 Elsevier Inc.保留所有权利。

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