Comparing reductions to NP-complete sets

  • Authors:
  • John M. Hitchcock;A. Pavan

  • Affiliations:
  • Department of Computer Science, University of Wyoming, USA;Department of Computer Science, Iowa State University, USA

  • Venue:
  • Information and Computation
  • Year:
  • 2007

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Abstract

Under the assumption that NP does not have p-measure 0, we investigate reductions to NP-complete sets and prove the following:(1)Adaptive reductions are more powerful than nonadaptive reductions: there is a problem that is Turing-complete for NP but not truth-table-complete. (2)Strong nondeterministic reductions are more powerful than deterministic reductions: there is a problem that is SNP-complete for NP but not Turing-complete. (3)Every problem that is many-one complete for NP is complete under length-increasing reductions that are computed by polynomial-size circuits. The first item solves one of Lutz and Mayordomo's ''Twelve Problems in Resource-Bounded Measure'' (1999). We also show that every many-one complete problem for NE is complete under one-to-one, length-increasing reductions that are computed by polynomial-size circuits.