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Preprint Number 163
163. Itaï Ben Yaacov, Alexander Berenstein
On perturbations of Hilbert spaces and probability algebras with a generic automorphism
Submission date: 24 January 2009.
We prove that IHS_A, the theory of infinite dimensional Hilbert spaces equipped with a generic automorphism, is \aleph_0-stable up to perturbation of the automorphism, and admits prime models up to perturbation over any set. Similarly, APr_A, the theory of atomless probability algebras equipped with a generic automorphism is \aleph_0-stable up to perturbation. However, not allowing perturbation it is not even superstable.
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