On unitarily equivalent submodules

Details On unitarily equivalent submodules On unitarily equivalent submodules

2007-07-20

arxiv.org/abs/0707.3122v1

Mathematics

Operator Algebras

19 pages, no figure

Scientific paper

The Hardy space on the unit ball in C^n provides examples of a quasi-free, finite rank Hilbert module which contains a pure submodule isometrically isomorphic to the module itself. For n=1 the submodule has finite codimension. In this note we show that this phenomenon can only occur for modules over domains in the complex plain and for finitely-connected domains only for Hardy-like spaces, the bundle shifts. Moreover, we show for essentially reductive modules that even when the codimension is infinite, the module is subnormal and again, on nice domains such as the unit ball, must be Hardy-like.

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