Vol. 133, No. 1, 1988

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Unitary equivalence of invariant subspaces of Bergman and Dirichlet spaces

Stefan Richter

Vol. 133 (1988), No. 1, 151–156
Abstract

In this paper we investigate unitary equivalence of invariant subspaces of the Bergman and the Dirichlet space. By definition, this means unitary equivalence of the multiplication operator Mz restricted to the invariant subspaces.

We show that no two invariant subspaces of the Bergman space are unitarily equivalent to one another unless they are equal. Under some extra assumption on the invariant subspaces we obtain a similar result for the Dirichlet space.

Mathematical Subject Classification 2000
Primary: 47B38
Secondary: 46E20, 46J15, 47A15, 47B37
Milestones
Received: 20 August 1986
Published: 1 May 1988
Authors
Stefan Richter