A Tight Upper Bound on the Probabilistic Embedding of Series-Parallel Graphs

  • Authors:
  • Yuval Emek;David Peleg

  • Affiliations:
  • yuvale@eng.tau.ac.il;david.peleg@weizmann.ac.il

  • Venue:
  • SIAM Journal on Discrete Mathematics
  • Year:
  • 2009

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Abstract

We prove that every unweighted series-parallel graph can be probabilistically embedded into its spanning trees with logarithmic distortion. This is tight due to an $\Omega(\log n)$ lower bound established by Gupta, Newman, Rabinovich, and Sinclair on the distortion required to probabilistically embed the $n$-vertex diamond graph into a collection of dominating trees. Our upper bound is gained by presenting a polynomial time probabilistic algorithm that constructs spanning trees with low expected stretch. This probabilistic algorithm can be derandomized to yield a deterministic polynomial time algorithm for constructing a spanning tree of a given (unweighted) series-parallel graph $G$, whose communication cost is at most $O(\log n)$ times larger than that of $G$.