Configuration spaces of rings and wickets

Details Configuration spaces of rings and wickets Configuration spaces of rings and wickets

2008-05-28

arxiv.org/abs/0805.4354v2

Mathematics

Geometric Topology

28 pages. Some revisions in the exposition

Scientific paper

The main result in this paper is that the space of all smooth links in Euclidean 3-space isotopic to the trivial link of n components has the same homotopy type as its finite-dimensional subspace consisting of configurations of n unlinked Euclidean circles (the "rings" in the title). There is also an analogous result for spaces of arcs in upper half-space, with circles replaced by semicircles (the "wickets" in the title). A key part of the proofs is a procedure for greatly reducing the complexity of tangled configurations of rings and wickets. This leads to simple methods for computing presentations for the fundamental groups of these spaces of rings and wickets as well as various interesting subspaces. The wicket spaces are also shown to be K(G,1)'s.

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