A chain complex and Quadrilaterals for normal surfaces

Details A chain complex and Quadrilaterals for normal surfaces A chain complex and Quadrilaterals for normal surfaces

2008-10-02

arxiv.org/abs/0810.0342v1

Mathematics

Geometric Topology

7 pages, 1 figure

Scientific paper

We interpret a normal surface in a (singular) three-manifold in terms of the homology of a chain complex. This allows us to study the relation between normal surfaces and their quadrilateral co-ordinates. Specifically, we give a proof of an (unpublished) observation independently given by Casson and Rubinstein saying that quadrilaterals determine a normal surface up to vertex linking spheres. We also characterise the quadrilateral coordinates that correspond to a normal surface in a (possibly ideal) triangulation.

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