Abstract
For an area preserving, monotone twist diffeomorphism and an irrational number ω, we prove that if there is no invariant circle of angular rotation number ω, then there are uncountably many Denjoy minimal sets of angular rotation number ω. For each pair of positive integersn andR we prove that the space (with the vague topology) of Denjoy minimal sets of angular rotation number ω and intrinsic rotation number (ω+R)/n (mod. 1) contains a disk of dimensionn−1.
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Partially supported by NSF contract #MCS82-01604.
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Mather, J.N. More Denjoy minimal sets for area preserving diffeomorphisms. Commentarii Mathematici Helvetici 60, 508–557 (1985). https://doi.org/10.1007/BF02567431
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DOI: https://doi.org/10.1007/BF02567431