Betti numbers of closed manifolds or finite simplicial complexes are classical invariants in algebraic topology. Atiyah proposed an L2-version obtained from the universal covering and the action of the fundamental group using von Neumann algebras. We will present the basic properties of these L2-Betti numbers and discuss applications to topology, algebra, group theory, and geometry which are both interesting and not hard to explain.
Join the Mathematics Colloquium with Wolfgang Lück from the University of Bonn in Germany, who will talk about L2-Betti numbers.
- When
- Thursday 8 May 2025, 4 pm - 5 pm
- Speaker
- Wolfgang Lück
- Location
- Huygens building HG00.616
- Organisation
- Mathematics
Contact information
More information? Please get in touch with Annegret Burtscher or Jeanine Houwing-Duistermaat.
