A time lower bound for satisfiability

  • Authors:
  • Dieter van Melkebeek;Ran Raz

  • Affiliations:
  • Department of Computer Sciences, University of Wisconsin, Madison, WI;Faculty of Mathematics and Computer Science, Weizmann Institute of Science, Rehovot, Israel

  • Venue:
  • Theoretical Computer Science - Automata, languages and programming: Algorithms and complexity (ICALP-A 2004)
  • Year:
  • 2005

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Abstract

We show that a deterministic Turing machine with one d-dimensional work tape and random access to the input cannot solve satisfiability in time na for a d + 2)/(d + 1). For conondeterministic machines, we obtain a similar lower bound for any a such that a3 a/(d + 1). The same bounds apply to almost all natural NP-complete problems known.