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Rotation number, old and new

Alessandra Iozzi (ETH Zürich) viernes 31 ago. 12 horas
Ponente:
Cuándo 31/08/2012
de 12:00 a 13:00
Dónde Salón Graciela Salicrup
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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.

We will then describe applications, among which classification theorems in the same 
spirit as the above.