Mathematics – Geometric Topology
Scientific paper
2009-01-15
Mathematics
Geometric Topology
12 pages, 5 figures. An earlier version of this paper attempted to construct a stable homotopy type from a grid presentation o
Scientific paper
We explore a somewhat unexpected connection between knot Floer homology and shellable posets, via grid diagrams. Given a grid presentation of a knot K inside S^3, we define a poset which has an associated chain complex whose homology is the knot Floer homology of K. We then prove that the closed intervals of this poset are shellable. This allows us to combinatorially associate a PL flow category to a grid diagram.
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