Deformations of representations of discrete subgroups of SO (3,1).
Des groupes magiques ou quand des sous-groupes libres affines opèrent proprement discontinûment sur
Designs, groups and lattices
The notion of designs in Grassmannian spaces was introduced by the author and R. Coulangeon, G. Nebe, in [3]. After having recalled some basic properties of these objects and the connections with the theory of lattices, we prove that the sequence of Barnes-Wall lattices hold -Grassmannian designs. We also discuss the connections between the notion of Grassmannian design and the notion of design associated with the symmetric space of the totally isotropic subspaces in a binary quadratic space, which...
Dirichlet domains for the Mostow lattices.
Discrete cocompact subgroups of the five-dimensional connected and simply connected nilpotent Lie groups.
Discrete groups of affine isometries.
Diskrete Untergruppen von SL2 (IR).
Divergent trajectories of flows on homogeneous spaces and Diophantine approximation.