Homology lens spaces and Dehn surgery on homology spheres
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If M 3 is a homology sphere, consider the Mayer–Vietoris sequence . . . → H 2 (M ) → H 1 (∂T ) −−−→ H (i∗
For the reverse implication, let T ⊆ Σ 3 be a solid torus in a homology sphere, µ a meridian of T , F a Seifert surface for T , λ = ∂F the preferred longitude of T , and X = Σ 3 − int(T ). Let M 3 be the manifold obtained by performing an (n/m)-Dehn surgery which replaces T with T 0 . Lemma 2.1 makes it easy to see that M 3 is a homology n-lens space. We now construct a degree ±1 map f : M 3 → L(n, m). Let L(n, m) = V 1 ∪ V 2 as above. Let f | T0
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Key words and phrases: Braid group, configuration space, homology, Coxeter group, gener- alized braid group, Thom spectrum, Eilenberg-MacLane spectrum.. The paper is in final form