Derandomized squaring of graphs

  • Authors:
  • Eyal Rozenman;Salil Vadhan

  • Affiliations:
  • Division of Engineering & Applied Sciences, Harvard University, Cambridge, Massachusetts;Department of Computer Science & Applied Mathematics, Weizmann Institute, Rehovot, Israel

  • Venue:
  • APPROX'05/RANDOM'05 Proceedings of the 8th international workshop on Approximation, Randomization and Combinatorial Optimization Problems, and Proceedings of the 9th international conference on Randamization and Computation: algorithms and techniques
  • Year:
  • 2005

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Abstract

We introduce a “derandomized” analogue of graph squaring. This operation increases the connectivity of the graph (as measured by the second eigenvalue) almost as well as squaring the graph does, yet only increases the degree of the graph by a constant factor, instead of squaring the degree. One application of this product is an alternative proof of Reingold's recent breakthrough result that S-T Connectivity in Undirected Graphs can be solved in deterministic logspace.