The C*-algebra generated by irreducible Toeplitz and composition operators

Abstract

We describe the C*-algebra generated by an irreducible Toeplitz operator $T_{\psi }$, with continuous symbol $\psi$ on the unit circle $\mathbb{T}$, and finitely many composition operators on the Hardy space $H^2$ induced by certain linear-fractional self-maps of the unit disc, modulo the ideal of compact operators $K(H^2)$. For composition operators with automorphism symbols, we show that this algebra is not isomorphic to the one generated by the shift and composition operators.

14 pages, 2 figures