Efficient embeddings of ternary trees into hypercubes

  • Authors:
  • Ajay K. Gupta;Donald Nelson;Hong Wang

  • Affiliations:
  • Department of Computer Science, Western Michigan University, 3312 Friedmann Hall, Kalamazoo, MI;Department of Computer Science, Western Michigan University, 3312 Friedmann Hall, Kalamazoo, MI;AT&T Network Services, Kansas, City, MO

  • Venue:
  • Journal of Parallel and Distributed Computing
  • Year:
  • 2003

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Abstract

In this paper we present efficient graph embeddings for complete k-ary trees into boolean hypercubes. In particular, we describe an efficient embedding of a complete ternary tree (k = 3) of height h into a hypercube, which achieves dilation 3 and expansion Θ(1.0104...h). The previously best-known result is dilation 2 and expansion Θ(1.333...h). Our embedding achieves exponentially better expansion at the cost of an increase of 1 in the dilation. We also describe efficient embeddings of k-ary trees into hypercubes when k = 2p * 3q for some p, q 0 such that the embeddings achieve small constant dilation.