On cohomology rings of infinite groups

Details On cohomology rings of infinite groups On cohomology rings of infinite groups

2005-02-24

arxiv.org/abs/math/0502513v2

Mathematics

K-Theory and Homology

6 pages

Scientific paper

Let R be any ring (with 1), \Gamma a group and R\Gamma the corresponding group ring. Let Ext_{R\Gamma}^{*}(M,M) be the cohomology ring associated to the R\Gamma-module M. Let H be a subgroup of finite index of \Gamma. The following is a special version of our main Theorem: Assume the profinite completion of \Gamma is torsion free. Then an element \zeta in Ext_{R\Gamma}^{*}(M,M) is nilpotent (under Yoneda's product) if and only if its restriction to Ext_{RH}^{*}(M,M)$ is nilpotent. In particular this holds for the Thompson group. There are torsion free groups for which the analogous statement is false.

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