2004
DOI: 10.2140/gt.2004.8.1043
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The surgery obstruction groups of the infinite dihedral group

Abstract: This paper computes the quadratic Witt groups (the Wall L-groups) of the polynomial ring Z[t] and the integral group ring of the infinite dihedral group, with various involutions. We show that some of these groups are infinite direct sums of cyclic groups of order 2 and 4. The techniques used are quadratic linking forms over Z[t] and Arf invariants.

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Cited by 21 publications
(38 citation statements)
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“…Because of Corollary 3.6 and assumption (VCL) it suffices to check that the following assembly map is an isomorphism (c) The proof is analogous to the one of assertion (b) using the conclusion from [34] that for any virtually cyclic group V the assembly map There a term UNIL appears which has meanwhile been computed by Connolly and Davis [8]. The computation of Wh q (F ) for a Fuchsian groups F for q ≤ 1 was independently carried out in [3] and [4] using the p-chain spectral sequence.…”
Section: Definition 311mentioning
confidence: 99%
“…Because of Corollary 3.6 and assumption (VCL) it suffices to check that the following assembly map is an isomorphism (c) The proof is analogous to the one of assertion (b) using the conclusion from [34] that for any virtually cyclic group V the assembly map There a term UNIL appears which has meanwhile been computed by Connolly and Davis [8]. The computation of Wh q (F ) for a Fuchsian groups F for q ≤ 1 was independently carried out in [3] and [4] using the p-chain spectral sequence.…”
Section: Definition 311mentioning
confidence: 99%
“…2 Remark 2.2. Connolly-Davis ( [7]) completed the computation of L n (Z/2 * Z/2, ω) for all n and all orientation characters ω. As a result, one can modify the above construction using orientation reversing involutions on tori with isolated fixed sets, to produce different examples.…”
Section: H )mentioning
confidence: 99%
“…For the computation of these terms UNil n (Z/2 * Z/2; R) we refer to [2], [9] and [10]. They have exponent four and they are either trivial or are infinitely generated as abelian groups.…”
Section: Next We Compute the Groups Hmentioning
confidence: 99%