Algebraic K-theory over the infinite dihedral group: a controlled topology approach

Details Algebraic K-theory over the infinite dihedral group: a controlled topology approach Algebraic K-theory over the infinite dihedral group: a controlled topology approach

2010-02-19

arxiv.org/abs/1002.3702v2

Mathematics

K-Theory and Homology

Accepted for publication by the Journal of Topology, 23 pages, proof of Lemma 4.1 simplified

Scientific paper

We use controlled topology applied to the action of the infinite dihedral group on a partially compactified plane and deduce two consequences for algebraic K-theory. The first is that the family in the K-theoretic Farrell-Jones conjecture can be reduced to only those virtually cyclic groups which admit a surjection with finite kernel onto a cyclic group. The second is that the Waldhausen Nil groups for a group which maps epimorphically onto the infinite dihedral group can be computed in terms of the Farrell-Bass Nil groups of the index two subgroup which maps surjectively to the infinite cyclic group.

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