... Paul Baum (Penn State University) . Dirac Operators and K theory for discrete groups . In this talk the BC (Baum-Connes) conjecture for discrete groups is reformulated using Dirac operators. ... Algebras of functions on stratified spaces . ... A. Connes proved that Hochschild homology of the algebra of smooth functions on a manifold corresponds to the Rham complex and that periodic cyclic homology (of the algebra) corresponds to the de Rham cohomology (of the manifold). ...