Catharina Stroppel (University of Bonn) will present "Categorification with applications in low-dimensional topology." Abstract: I would like to explain the idea of categorification along the questions: what do we mean by this and why is it useful? The applications presented will be from low dimensional topology and knot theory. The solution and categories involved are however coming from Lie theory and algebraic geometry. The talk should give an overview about the concepts illustrated by a few concrete examples.