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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)


Unitary $ {\bf Z}\sp d$-actions with continuous spectrum

Authors: Vitaly Bergelson, Isaac Kornfeld and Boris Mityagin
Journal: Proc. Amer. Math. Soc. 119 (1993), 1127-1134
MSC: Primary 47A35; Secondary 47B99
MathSciNet review: 1145413
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Abstract: For any unitary $ {\mathbb{Z}^d}$-action on a Hilbert space with continuous spectrum weakly wandering vectors are dense. This wandering can be forced to occur along $ IP$-sets. This is a generalization and strengthening of a result due to Krengel. Our method is based on the contractive mapping fixed-point theorem.

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PII: S 0002-9939(1993)1145413-4
Article copyright: © Copyright 1993 American Mathematical Society