Research Horizons Seminar
Wednesday, September 3, 2014 - 12:00
1 hour (actually 50 minutes)
Here is a classical theorem. Consider a bijection (just a set map!) from the Euclidean plane to itself that takes 0 to 0 and takes the points on an arbitrary line to the points on a (possibly different line). The theorem is that such a bijection always comes from a linear map. I'll discuss various generalizations of this theorem in geometry, topology, and algebra, ending with a discussion of some recent, related research on the topology of surfaces.