A panorama of L^2-invariants (Wolfgang LÜCK, University of Bonn)

Betti numbers of closed manifolds or finite simplicial complexes are classical invariants in algebraic topology. Atiyah proposed an L^2-version obtained from the universal covering and the action of the fundamental group using von Neumann algebras. We…

Conseil Général 7-9 / Salle 1-15, Colloque de mathématiques