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Abstract. We prove similar theorems concerning the structure of bundles involving complements of ®ber-type hyperplane arrangements and orbit con®guration spaces. These results facilitate analysis of the fundamental groups of these spaces, which may be viewed as generalizations of the Artin pure braid group. In particular, we resolve two disparate conjectures. We show that the Whitehead group of the fundamental group of the complement of a ®ber-type arrangement is trivial, as conjectured by Aravinda, Farrell, and Rouchon [AFR]. For the orbit con®guration space corresponding to the natural action of a ®nite cyclic group on the punctured plane, we determine the structure of the Lie algebra associated to the lower central series of the fundamental group. Our results show that this Lie algebra is isomorphic to the module of primitives in the homology of the loop space of a related orbit con®guration space, as con jectured by Xicotencatl [Xi]. 2000 Mathematics Subject Classi®cation: 20F36, 52C35; 19B99, 20F40. Introduction Let M be a manifold without boundary of dimension at least two. The con®guration space of n ordered points in M is the subspace of the product space M n de®ned by F MY n fx1 Y F F F Y xn
Forum Mathematicum – de Gruyter
Published: May 17, 2001
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