Mini-Workshop, Universität Konstanz, December 6 & 7, 2002

The workshop centres around a result of Atiyah's in equivariant K-theory. Apparently this theorem has not received much attention so far, although it generalises the so-called Chang-Skjelbred lemma, which has recently become an important tool to calculate the cohomology of toric varieties and Hamiltonian T-spaces. We expect Atiyah's result to have a similar impact. The aim of our workshop is to present Atiyah's result (with proof) as well as some related results and possible applications. It is supported by the DFG-Schwerpunkt Globale Methoden in der komplexen Geometrie.

Please contact any of the organisers for further information.


Matthias Franz (Université Joseph Fourier, Grenoble), Volker Puppe (Universität Konstanz)


Winfried Bruns (Universität Osnabrück), Karl-Heinz Fieseler (Uppsala  Universitet), Matthias Franz, Jean-Claude Hausmann (Université de Genève), Angelo Vistoli (Università degli Studi di Bologna)

Invited guests

Annette A'Campo-Neuen (Universität Mainz), Jean-Paul Brasselet (Institut de Mathématiques de Luminy, Marseille), Andrzej Weber (Uniwersytet Warszawski)


Friday afternoon

15:30-16:30 Winfried Bruns: Cohen-Macaulay modules.

17:00-18:00 Matthias Franz: Atiyah's result on equivariantly formal spaces.

Saturday morning

10:00-11:00 Karl-Heinz Fieseler: Intersection cohomology for toric varieties and fans - equivariant and non-equivariant.

11:30-12:30 Angelo Vistoli: The K-theory of algebraic torus actions.

Saturday afternoon

15:30-16:30 Jean-Claude Hausmann: Involutions with a strong real core.

All lectures take place in room F426.