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Quotient Algebras of Toeplitz-Composition C?-Algebras for Finite Blaschke Products

机译:有限Blaschke产品的Toeplitz成分C?-代数的商代数

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Let R be a finite Blaschke product.We study the C?-algebraT C_R generated by both the composition operator C_R and the Toeplitz operator Tz on the Hardy space. We show that the simplicity of the quotient algebra O_(CR) by the ideal of the compact operators can be characterized by the dynamics near the Denjoy-Wolff point of R if the degree of R is at least two. Moreover we prove that the degree of finite Blaschke products is a complete isomorphism invariant for the class of O_(CR) such that R is a finite Blaschke product of degree at least two and the Julia set of R is the unit circle, using the Kirchberg-Phillips classification theorem.
机译:设R为有限的Blaschke乘积。我们研究在Hardy空间上由合成算子C_R和Toeplitz算子Tz生成的Cα-代数T C_R。我们证明,如果R的阶数至少为2,则紧凑算子的理想商数O_(CR)的简单性可以通过R的Denjoy-Wolff点附近的动力学来表征。此外,我们使用基尔希贝格(Kirchberg)证明了有限Blaschke积的度是O_(CR)类的完全同构不变量,因此R是至少2度的有限Blaschke积,R的Julia集是单位圆。 -菲利普斯分类定理。

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