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Published January 15, 1990 | public
Journal Article

Diffeomorphisms of manifolds with nonsingular Poincaré flows

Hawkins, Jane

Abstract

In this paper we study the question of which countable amenable ergodic equivalence relations can be realized as C∞ group actions on manifolds. It has been proved that every countable equivalence relation which is amenable, nonsingular, and ergodic is orbit equivalent to an ergodic integer action on a measure space [CFW]. Katznelson showed that any ITPFI ergodic equivalence relation is orbit equivalent to some C∞ diffeomorphism of the circle. He also proved that every ergodic C^3 diffeomorphism of the circle generates an amenable ITPFI equivalence relation [Ka].

Additional Information

© 1990 Published by Elsevier. Received 9 May 1988. Submitted by Dorothy Maharam Stone. Research partially supported by the NSF under Grant DMS-8418431. The author is grateful to R. Wong for helpful discussions on this topic. A. Ramsay and K. Schmidt also helped improve the results of this paper with their suggestions and comments.

Additional details

Created:
September 28, 2023
Modified:
October 24, 2023