Higher intersections in 4-manifolds: Conversations about the failure of the Whitney move

Conversations about the failure of the Whitney move Rob Schneiderman and Peter Teichner (MPIM) This is the first of 4 evenings where we shall experiment with a new way of communicating geometric mathematics. We'll show lots of pictures and discuss carefully their precise mathematical interpretation. In the first conversation, we'll give an introduction to the main problem in 4-dimensional topology.