The Schur multiplier of a generalized Baumslag-Solitar group
The semigroup of finite complexes of a group
The split building of a reductive group.
The Structure of Ext (A,..) and V = L.
The structure of finite p-groups: effective proof of the coclass conjectures.
The structure of -free nilpotent groups of step 3.
The structure of subnormal subgroups of symplectic groups over local rings.
The structure of the rings assigned to group varieties
The subgroups in the special linear group over a skew field that contain the group of diagonal matrices
The subgroups of , or how to compute the table of marks of a finite group.
The surjectivity problem for one-generator, one-relator extensions of torsion-free groups.
The Symmetries of Classes of Elements in a Free Group of Rank Two.
The symmetry of intersection numbers in group theory.
The theorem of Borevich for the hyperbolic unitary group over a noncommutative field.
The Tits alternative for . I: Dynamics of exponentially-growing automorphisms.
The variety of topological groups generated by the free topological group on [0,1]
The virtual and universal braids
We study the structure of the virtual braid group. It is shown that the virtual braid group is a semi-direct product of the virtual pure braid group and the symmetric group. Also, it is shown that the virtual pure braid group is a semi-direct product of free groups. From these results we obtain a normal form of words in the virtual braid group. We introduce the concept of a universal braid group. This group contains the classical braid group and has as quotients the singular braid group, virtual...
The virtual Haken conjecture: Experiments and examples.
The Z*-theorem for compact Lie groups.
Théorème de Kurosh pour les relations d’équivalence boréliennes
En théorie des groupes, le théorème de Kurosh est un résultat de structure concernant les sous-groupes d’un produit libre de groupes. Le théorème principal de cet article est un résultat analogue dans le cadre des relations d’équivalence boréliennes à classes dénombrables, que nous démontrons en développant une théorie de Bass-Serre dans ce cadre particulier.