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Bulletin of the American Mathematical Society

The Bulletin publishes expository articles on contemporary mathematical research, written in a way that gives insight to mathematicians who may not be experts in the particular topic. The Bulletin also publishes reviews of selected books in mathematics and short articles in the Mathematical Perspectives section, both by invitation only.

ISSN 1088-9485 (online) ISSN 0273-0979 (print)

The 2020 MCQ for Bulletin of the American Mathematical Society is 0.84.

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Rotation numbers and instability sets
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by John Franks PDF
Bull. Amer. Math. Soc. 40 (2003), 263-279 Request permission

Abstract:

Translation and rotation numbers have played an interesting and important role in the qualitative description of various dynamical systems. In this exposition we are especially interested in applications which lead to proofs of periodic motions in various kinds of dynamics on the annulus. The applications include billiards and geodesic flows.

Going beyond this simple qualitative invariant in the study of the dynamics of area preserving annulus maps, G.D. Birkhoff was led to the concept of “regions of instability” for twist maps. We discuss the closely related notion of instability sets for a generic area preserving surface diffeomorphism and develop their properties.

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Additional Information
  • John Franks
  • Affiliation: Department of Mathematics, Northwestern University, Evanston, Illinois 60208-2730
  • MR Author ID: 68865
  • Email: john@math.northwestern.edu
  • Received by editor(s): December 31, 2002
  • Published electronically: April 8, 2003
  • Additional Notes: Supported in part by NSF grant DMS0099640. This article is the written version of an invited address at the January 2002 AMS meeting in San Diego, California
  • © Copyright 2003 American Mathematical Society
  • Journal: Bull. Amer. Math. Soc. 40 (2003), 263-279
  • MSC (2000): Primary 37E45
  • DOI: https://doi.org/10.1090/S0273-0979-03-00983-2
  • MathSciNet review: 1978565