Pure Maths Colloquium: Rotation number, old and new
15 November 2010 17:15 in CM221
Rotation numbers classify orientation preserving homeomorphisms of the circle (hence actions of the integers) up to semiconjugacy. After recalling the classical theory, we will show how one can generalize the notion of rotation number both to actions of groups
larger than the integers and to actions on manifolds more complicated than the circle, or both.
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