Abstract
We give examples of analytic critical circle maps which are not C 1+α rigid.
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Avila, A. On rigidity of critical circle maps. Bull Braz Math Soc, New Series 44, 611–619 (2013). https://doi.org/10.1007/s00574-013-0027-5
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DOI: https://doi.org/10.1007/s00574-013-0027-5