Constructable Solvable Groups.
Continuous Cohomology and a Conjecture of Serre's.
Controlled connectivity of closed 1-forms.
Corners and Arithmetic Groups
Crossed modules, Crossed n-fold extension of groups and Cohomology theory in Abstract Categories
Crossed n-folds extensions of groups and cohomology.
Crossed product of cyclic groups
All crossed products of two cyclic groups are explicitly described using generators and relations. A necessary and sufficient condition for an extension of a group by a group to be a cyclic group is given.
Cyclic homology of group rings
Cyclic homology of groups and the Bass conjecture.