one can use them to define topological invariants of 3- and 4-manifolds. Together, these invariants give rise to a variant of a TQFT (topological quantum field theory). In turn, this leads to several ...

EXC 2044 - B2: Topology We will analyse geometric structures from a topological point of view. In particular, we will study manifolds, their diffeomorphisms and embeddings, and positive scalar ...