16/04: Room M029; 18/04: Room M007; 20/04: Room M031. Coffee is served before each talk (09h00-09h30).

Monday, 16 April, 2012

16/04/2012. Introduction to Theory of Prime Ends

18/04/2012. Applications I: Index of iterates of planar homeomorphisms

20/04/2012. Applications II: Rotation number of planar attractors

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Abstract: Let U be a simply connected proper open set of the 2-sphere. While U is homeomorphic to the open disk, the boundary of U may have a very complicated topological structure. Carathéodory’s prime ends compactification allows one to compactify U, by adding the set of prime ends, in such a way that one obtains a closed disk. We will explain in a intuitive way how this compactification works and some applications to planar dynamics.

## Speaker:

Francisco Romero Ruiz del Portal (Universidad Complutense de Madrid)