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A Farey tree organization of locking regions for simple circle maps
Authors:K M Brucks  C Tresser
Institution:Department of Mathematical Sciences, University of Wisconsin, Milwaukee, Wisconsin 53211 ; Thomas J. Watson Research Center, I.B.M., P.O. Box 218, Yorktown Heights, New York 10598
Abstract:Let $f$ be a $C^3$ circle endomorphism of degree one with exactly two critical points and negative Schwarzian derivative. Assume that there is no real number $a$ such that $f + a$ has a unique rotation number equal to $\frac{p}{q}$. Then the same holds true for any $\frac{p'}{q'}$ such that $\frac{p}{q}$ stands above $\frac{p'}{q'}$ in the Farey tree and can be related to it by a path on the tree.

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