# American Institute of Mathematical Sciences

November  2009, 24(4): 1209-1213. doi: 10.3934/dcds.2009.24.1209

## On a question of Katok in one-dimensional case

 1 Department of Mathematics, Queens College of CUNY, Flushing, NY 11367

Received  August 2008 Revised  November 2008 Published  May 2009

We prove that a $C^{1}$ orientation-preserving circle endomorphism which is Hölder conjugate to a $C^{1}$ circle expanding endomorphism is itself expanding.
Citation: Yunping Jiang. On a question of Katok in one-dimensional case. Discrete & Continuous Dynamical Systems - A, 2009, 24 (4) : 1209-1213. doi: 10.3934/dcds.2009.24.1209
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