Randomly removing g handles at once

  • Authors:
  • Glencora Borradaile;James R. Lee;Anastasios Sidiropoulos

  • Affiliations:
  • School of Electrical Engineering and Computer Science, Oregon State University, United States;Computer Science Department, University of Washington, United States;Toyota Technological Institute at Chicago, United States

  • Venue:
  • Computational Geometry: Theory and Applications
  • Year:
  • 2010

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Abstract

Indyk and Sidiropoulos (2007) proved that any orientable graph of genus g can be probabilistically embedded into a graph of genus g-1 with constant distortion. Viewing a graph of genus g as embedded on the surface of a sphere with g handles attached, Indyk and Sidiropoulos' method gives an embedding into a distribution over planar graphs with distortion 2^O^(^g^), by iteratively removing the handles. By removing all g handles at once, we present a probabilistic embedding with distortion O(g^2) for both orientable and non-orientable graphs. Our result is obtained by showing that the minimum-cut graph of Erickson and Har-Peled (2004) has low dilation, and then randomly cutting this graph out of the surface using the Peeling Lemma of Lee and Sidiropoulos (2009).