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Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

The 2024 MCQ for Proceedings of the American Mathematical Society is 0.85.

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Bifurcation to badly ordered orbits in one-parameter families of circle maps, or angels fallen from the devil’s staircase
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by Kevin Hockett and Philip Holmes
Proc. Amer. Math. Soc. 102 (1988), 1031-1051
DOI: https://doi.org/10.1090/S0002-9939-1988-0934888-7

Abstract:

We discuss the structure of the bifurcation set of a one-parameter family of endomorphisms of ${S^1}$ having two critical points and negative Schwarzian derivative. We concentrate on the case in which one of the endpoints of the rotation set is rational, providing a partial characterization of components of the nonwandering set having specified rotation number and the bifurcations in which they are created. In particular we find, for each rational rotation number $p’/q’$ less than the upper boundary of the rotation set $p/q$, infinitely many saddle-node bifurcations to badly ordered periodic orbits of rotation number $p’/q’$.
References
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Bibliographic Information
  • © Copyright 1988 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 102 (1988), 1031-1051
  • MSC: Primary 58F08; Secondary 58F14
  • DOI: https://doi.org/10.1090/S0002-9939-1988-0934888-7
  • MathSciNet review: 934888