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arXiv 1809.04700math.OA
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由左可逆元生成的算子代数

Operator algebras generated by left invertibles

Derek DeSantis

摘要:

由部分等距和它们的伴随生成的算子代数形成了一些研究得最好的C* 代数类的基础。本文主要研究由左可逆$T$及其Moore-Penrose逆$T^\dagger$生成的范数闭算子代数。我们用$\mathfrak{A}_T$表示这个代数。在等距情形下,$T^\dagger = T^*$和$\mathfrak{A}_T$是Toeplitz代数的表示。特别感兴趣的是当$T$满足称为解析的非简并条件时的情况。我们证明了$T$是解析的当且仅当$T^*$是Cowen-Douglas的.当$T$是解析的且具有Fredholm指标$-1$时,代数$\mathfrak{A}_T$包含紧算子,并且任何两个这样的代数是有界同构的当且仅当它们相似。

英文摘要:

Operator algebras generated by partial isometries and their adjoints form the basis for some of the most well studied classes of C*-algebras. The primary object of this paper is the norm-closed operator algebra generated by a left invertible $T$ together with its Moore-Penrose inverse $T^\dagger$. We denote this algebra by $\mathfrak{A}_T$. In the isometric case, $T^\dagger = T^*$ and $\mathfrak{A}_T$ is a representation of the Toeplitz algebra. Of particular interest is the case when $T$ satisfies a non-degeneracy condition called analytic. We show that $T$ is analytic if and only if $T^*$ is Cowen-Douglas. When $T$ is analytic with Fredholm index $-1$, the algebra $\mathfrak{A}_T$ contains the compact operators, and any two such algebras are boundedly isomorphic if and only if they are similar.

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