**UM Math Graduate Students Seminar**

Blake Icabone

* University of Miami *

**will present**

**The Poincaré-Hopf Theorem **

Friday, April 5, 2013, 3:45pm

Ungar Building Room 402

**Abstract:**At any time, there is at least one point on the surface of the earth at which the wind is completely still. Why? We answer this question as we prove the Poincaré-Hopf theorem for surfaces, and recover a familiar topological invariant.

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