Mathematics – Geometric Topology
Scientific paper
2004-10-28
Mathematics
Geometric Topology
33 pages, 17 figures; corrected Lemma 9, and retracted stratified structure theorem
Scientific paper
A classical combinatorial fact is that the simplicial complex consisting of disjointly embedded chords in a convex planar polygon is a sphere. For any surface F with non-empty boundary, there is an analogous complex Arc(F) consisting of suitable equivalence classes of arcs in F connecting its boundary components. The main result of this paper is the determination of those arc complexes Arc(F) that are also spherical. This classification has consequences for Riemann's moduli space via its known identification with an analogous arc complex in the punctured case with no boundary. Namely, the essential singulities of the natural cellular compactification can be described.
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