The low-dimensional homology of crossed modules.
The Mac Lane method of construction and classification of extensions of cyclic groups by their automorphism groups.
The Number of Stem Covers of an Elementary Abelian p-Group.
The Poincaré Series of a Coxeter Group.
The p-period of an infinite group.
For Γ a group of finite virtual cohomological dimension and a prime p, the p-period of Γ is defined to be the least positive integer d such that Farrell cohomology groups Hi(Γ; M) and Hi+d(Γ; M) have naturally isomorphic ZΓ modules M.We generalize a result of Swan on the p-period of a finite p-periodic group to a p-periodic infinite group, i.e., we prove that the p-period of a p-periodic group Γ of finite vcd is 2LCM(|N(〈x〉) / C(〈x〉)|) if the Γ has a finite quotient whose a p-Sylow subgroup is elementary...
The Second Homology Group of the Mapping Class Group of an Orientable Surface.
The variety of an indecomposable module is connected.
The virtual cohomological dimension of the mapping class group of an orientable surface.
The Whitehead categorical group of derivations.
Three-Dimensional Poincaré Duality Groups Which Are Extensions.
Tiling systems and homology of lattices in tree products.
Trees, valuations, and the Bieri-Neumann-Strebel invariant.
Über die cohomologische Dimension der auflösbaren Gruppen.
Über maximale arithmetisch definierte Gruppen.
Ulm Invariants of the Brauer Group of a Field.
Ulm Invariants of the Brauer Group of a Field. II.
Un théorême sur les sommes amalgamées de groupes simpliciaux.
Una proprietà caratteristica dei gruppi abeliani torsionalmente completi
Une construction intrinsèque du cœur de l'invariant de Casson
Nous donnons une nouvelle construction cohomologique du cœur de l'invariant de Casson et nous donnons un nouveau calcul de ses valeurs sur les générateurs du sous- groupe de Johnson du mapping class group.
Valuations on free resolutions and higher geometric invariants of groups.