Chern Classes and Extraspecial Groups.
Chern-Klassen von ganzzahligen und rationalen Darstellungen dsikreter Gruppen.
Classes de Stiefel-Whitney de Formes quadratiques et de représentations galoisiennes réelles.
Clinic obstructions and clinic cohomological groups.
Coherent pair of extensions of locally compact groups
Cohomological characterization of relative hyperbolicity and combination theorem.
Cohomological Triviality.
Cohomologie des groupes discrets
Cohomology and group actions.
Cohomology and Group Actions.
Cohomology of classifying spaces of complex Lie groups and related discrete groups.
Cohomology of groups, Abelian Sylow subgroups and splendid equivalences.
Cohomology of groups with operators.
Cohomology of integer matrices and local-global divisibility on the torus
Let be a prime and let be a -group of matrices in , for some integer . In this paper we show that, when , a certain subgroup of the cohomology group is trivial. We also show that this statement can be false when . Together with a result of Dvornicich and Zannier (see [2]), we obtain that any algebraic torus of dimension enjoys a local-global principle on divisibility by .
Cohomology of modules in the principal block of a finite group.
Cohomology of unipotent algebraic and finite groups and the Steenrod algebra.
Cohomology rings of Artin groups
In this paper integer cohomology rings of Artin groups associated with exceptional groups are determined. Computations have been carried out by using an effective method for calculation of cup product in cellular cohomology which we introduce here. Actually, our method works in general for any finite regular complex with identifications, the regular complex being geometrically realized by a compact orientable manifold, possibly with boundary.
Compactly supported cohomology of systolic 3-pseudomanifolds
We show that the second group of cohomology with compact supports is nontrivial for three-dimensional systolic pseudomanifolds. It follows that groups acting geometrically on such spaces are not Poincaré duality groups.
Complexity and Multiple Complexes.
Computing second cohomology of finite groups with trivial coefficients.