Beurling and Model subspaces invariant under a universal operator

Ben Hur Eidt, S. Waleed Noor

In this article, we characterize the Beurling and Model subspaces of the Hardy-Hilbert space $H^2(\mathbb{D})$ invariant under the composition operator $C_{\ddot{I}{•}_a}f=f\circ \ddot{I}{•}_a$, wher…