Rotation number, old and new
Alessandra Iozzi (ETH Zürich) viernes 31 ago. 12 horas
When |
Aug 31, 2012
from 12:00 PM to 01:00 PM |
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Where | 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.