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A Reformulation of the Arora-Rao-Vazirani Structure Theorem

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arxiv 1102.1456 v1 pith:URU3UUNZ submitted 2011-02-07 cs.DM

A Reformulation of the Arora-Rao-Vazirani Structure Theorem

classification cs.DM
keywords geometricsetsapproximationinequalitiespointsstructuretheoremtriangle
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In a well-known paper[ARV], Arora, Rao and Vazirani obtained an O(sqrt(log n)) approximation to the Balanced Separator problem and Uniform Sparsest Cut. At the heart of their result is a geometric statement about sets of points that satisfy triangle inequalities, which also underlies subsequent work on approximation algorithms and geometric embeddings. In this note, we give an equivalent formulation of the Structure theorem in [ARV] in terms of the expansion of large sets in geometric graphs on sets of points satisfying triangle inequalities.

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