On the optimal compression of sets in PSPACE

  • Authors:
  • Marius Zimand

  • Affiliations:
  • Department of Computer and Information Sciences, Towson University, Baltimore, MD

  • Venue:
  • FCT'11 Proceedings of the 18th international conference on Fundamentals of computation theory
  • Year:
  • 2011

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Abstract

We show that if DTIME[2O(n)] is not included in DSPACE [2O(n)], then, for every set B in PSPACE, all strings x in B of length n can be represented by a string compressed(x) of length at most log(|B=n|) + O(log n), such that a polynomial-time algorithm, given compressed(x), can distinguish x from all the other strings in B=n. Modulo the O(log n) additive term, this achieves the information-theoretical optimum for string compression.