Abstract

Beurling's theorem characterizes subspaces of the Hardy space invariant under the forward-shift operator in terms of inner functions. In this Note we consider the case where the ball replaces the open unit disk and the reproducing kernel Hilbert space with reproducing kernel 1/(1− ∑ 1 N z jw j ∗) replaces the Hardy space. We give explicit formulas which generalize Blaschke products in the case of spaces of finite codimension.

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