On the power of white pebbles

  • Authors:
  • Balasubramanian Kalyanasundaram;George Schnitger

  • Affiliations:
  • Department of Computer Science, The Pennsylvania State University;Department of Computer Science, The Pennsylvania State University

  • Venue:
  • STOC '88 Proceedings of the twentieth annual ACM symposium on Theory of computing
  • Year:
  • 1988

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Abstract

We construct a family (Gp | p) of directed acyclic graphs such that any black pebble strategy for Gp requires p2 pebbles whereas 3p+1 pebbles are sufficient when white pebbles are allowed.