C*-algebras generated by groups of composition operators

Details C*-algebras generated by groups of composition operators C*-algebras generated by groups of composition operators

2005-09-26

arxiv.org/abs/math/0509614v1

Mathematics

Operator Algebras

25 pages, no figures

Scientific paper

We compute the C*-algebra generated by a group of composition operators acting on certain reproducing kernel Hilbert spaces over the disk, where the symbols belong to a non-elementary Fuchsian group. We show that such a C*-algebra contains the compact operperators, and its quotient is isomorphic to the crossed product C*-algebra determined by the action of the group on the boundary circle. In addition we show that the C*-algebras obtained from composition operators acting on a natural family of Hilbert spaces are in fact isomorphic, and also determine the same Ext-class, which can be related to known extensions of the crossed product.

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