Welcome to SPP 2026
This is the platform of a coordinated research programme in mathematics, funded by the German Research Foundation (DFG). It comprises 33 research projects in the fields of differential geometry, geometric topology, and global analysis. More than 80 researchers from doctoral to professorial level and based at more than 20 German and Swiss universities are represented in this programme.
Latest publications
Agrarian and $L^2$-invariants
Fabian Henneke and Dawid Kielak
We develop the theory of agrarian invariants, which are algebraic counterparts to $L^2$-invariants. Specifically, we introduce the notions of agrarian...
Appendix to `Warped cones, (non-)rigidity, and piecewise properties' by Damian Sawicki
Dawid Kielak and Damian Sawicki
We prove that if a quasi-isometry of warped cones is induced by a map between the base spaces of the cones, the actions must be conjugate by this map....
Local Flexibility for Open Partial Differential Relations
Christian Bär, Bernhard Hanke
We show that local deformations of solutions to open partial differential relations near suitable subsets can be extended to global solutions,...
The Baum--Connes conjecture localised at the unit element of a discrete group
Paolo Antonini, Sara Azzali, Georges Skandalis
We construct a Baum--Connes assembly map localised at the unit element of a discrete group $\Gamma$.
This morphism, called $\mu_\tau$, is defined in...