## Groups of Circle DiffeomorphismsIn recent years scholars from a variety of branches of mathematics have made several significant developments in the theory of group actions. |

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### Contents

1 Examples of Group Actions on the Circle | 1 |

2 Dynamics of Groups of Homeomorphisms | 23 |

3 Dynamics of Groups of Diffeomorphisms | 80 |

4 Structure and Rigidity via Dynamical Methods | 158 |

5 Rigidity via Cohomological Methods | 226 |

Some Basic Concepts in Group Theory | 267 |

Invariant Measures and Amenable Groups | 269 |

273 | |

287 | |