The "Mathematisches Forschungsinstitut Oberwolfach" is an international
research centre situated in the middle of the Schwarzwald in the
south-western part of Germany. The Institute organizes around 50
one-week workshops per year where about 60 people gather for talks,
research, and the famous walk through the woods for the
Schwarzwälder Kirschtorte. This is an excerpt of the official report on the workshop held December 14-20, 2003 that was organized by
Wolf-Jürgen Beyn, Bernold Fiedler, and John
Guckenheimer.