On truth-table reducibility to SAT and the difference hierarchy over NP

@article{Buss1988OnTR,
  title={On truth-table reducibility to SAT and the difference hierarchy over NP},
  author={Samuel R. Buss and Louise Hay},
  journal={[1988] Proceedings. Structure in Complexity Theory Third Annual Conference},
  year={1988},
  pages={224-233}
}
  • S. Buss, L. Hay
  • Published 14 June 1988
  • Computer Science
  • [1988] Proceedings. Structure in Complexity Theory Third Annual Conference
It is shown that polynomial-time truth-table reducibility by Boolean circuits to SAT is the same as log-space truth-table reducibility via Boolean formulas to SAT and the same as log-space Turing reducibility to SAT. It is proved that a constant number of rounds of parallel queries to SAT is equivalent to one round of parallel queries. It is shown that the infinite difference hierarchy over NP is equal to Delta p/2, and an oracle separating Delta p/2 from the class of predicates polynomial time… 
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