Quotient algebras of Toeplitz-composition C*-algebras for finite Blaschke products

Details Quotient algebras of Toeplitz-composition C*-algebras for finite Blaschke products Quotient algebras of Toeplitz-composition C*-algebras for finite Blaschke products

2011-10-20

arxiv.org/abs/1110.4426v1

Mathematics

Operator Algebras

18 pages

Scientific paper

Let R be a finite Blaschke product. We study the C*-algebra TC_R generated by both the composition operator C_R and the Toeplitz operator T_z on the Hardy space. We show that the simplicity of the quotient algebra OC_R 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 OC_R 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.

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