The covariant representation-ring conjecture for infinite groups

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Let GG be a group and let FF be a field of characteristic zero. Define

Rcov⁡,F(G):=colim⁡H∈Sub⁡F ⁣I ⁣N(G)RF(H),R_{\operatorname{cov},F}(G):={\operatorname{colim}}_{H\in\operatorname{Sub}_{{\mathcal F}\!{\mathcal I}\!{\mathcal N}}(G)}R_F(H),

where the colimit uses induction along inclusions of finite subgroups. Covariant representation-ring conjecture. The obvious map

WG,F ⁣:Rcov⁡,F(G)⟶K0(F[G])W^{G,F}\colon R_{\operatorname{cov},F}(G)\longrightarrow K_0(F[G])

is a bijection of abelian groups. This conjecture follows from the Farrell–Jones conjecture for algebraic KK-theory for F[G]F[G]; no counterexamples were known at the time of writing.

References

Primary source

Wolfgang Lueck, “The Burnside Ring and Equivariant Stable Cohomotopy for Infinite Groups”, arXiv:math/0504051 (2005).

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