Skip to main content

NCk(NP)=ACk−1(NP)

  • Conference paper
  • First Online:
STACS 94 (STACS 1994)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 775))

Included in the following conference series:

Abstract

It is shown for any k≥1, that the closure of NP under NCk reducibility coincides with that of NP under ACk−1 reducibility, thereby giving an answer to a basic question that has been open for a long time. A similar result is shown for C=P.

Supported in part by the JSPS under grant NSF-INT-9116781/JSPS-ENG-207.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Institutional subscriptions

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. E. Allender and C. Wilson. Width-bounded reducibility and binary search over complexity classes. In Proceedings of the 5th Conference on Structure in Complexity Theory, pages 122–129. IEEE Computer Society Press, 1990.

    Google Scholar 

  2. C. Alvarez, J. Balcazar, and B. Jenner. Functional oracle queries as a measure of parallel time. In Proceedings of the 8th Symposium on Theoretical Aspects of Computer Science, pages 422–433. Springer-Verlag Lecture Notes in Computer Science #480, 1991.

    Google Scholar 

  3. A. Borodin. On relating time and space to size and depth. SIAM Journal on Computing, 6(4):733–744, December 1977.

    Google Scholar 

  4. S. Buss and L. Hay. On truth-table reducibility to SAT and the difference hierarchy over NP. In Proceedings of the 3rd Conference on Structure in Complexity Theory, pages 224–233. IEEE Computer Society Press, 1988.

    Google Scholar 

  5. J. Castro and C. Seara. Characterizations of some complexity classes between θ2/p and δ2/p. In Proceedings of the 9th Symposium on Theoretical Aspects of Computer Science, pages 305–317. Springer-Verlag Lecture Notes in Computer Science #577, 1992.

    Google Scholar 

  6. A. Chandra, L. Stockmeyer, and U. Vishkin. Constant depth reducibility. SIAM Journal on Computing, 13(2):423–439, May 1984.

    Google Scholar 

  7. S. Cook. The complexity of theorem proving procedures. In Proceedings of the 3rd Symposium on Theory of Computing, pages 151–158. ACM Press, 1971.

    Google Scholar 

  8. S. Cook. A taxonomy of problems with fast parallel algorithms. Information and Computation, 64:2–22, 1985.

    Google Scholar 

  9. M. Furst, J. Saxe, and M. Sipser. Parity, circuits, and the polynomial-time hierarchy. Mathematical Systems Theory, 17:13–27, 1984.

    Google Scholar 

  10. G. Gottlob. NP trees and Carnap's modal logic. In Proceedings of the 34th Symposium on Foundations of Computer Science. IEEE Computer Society Press, 1993. to appear.

    Google Scholar 

  11. R. Ladner and N. Lynch. Relativization of questions about logspace computability. Mathematical Systems Theory, 10:19–32, 1976.

    Google Scholar 

  12. R. Ladner, N. Lynch, and A. Selman. A comparison of polynomial time reducibilities. Theoretical Computer Science, l(2):103–123, 1975.

    Google Scholar 

  13. M. Ogiwara. Generalized theorems on the relationships among reducibility notions to certain complexity classes. Mathematical Systems Theory. to appear.

    Google Scholar 

  14. K. Wagner. The complexity of combinatorial problems with succinct input representation. Acta Informatica, 23:325–356, 1986.

    Google Scholar 

  15. K. Wagner. Bounded query classes. SIAM Journal on Computing, 19(5):833–846, October 1990.

    Google Scholar 

  16. C. Wilson. Relatizived circuit complexity. Journal of Computer and System Science, 31:169–181, 1985.

    Google Scholar 

  17. C. Wilson. Relatizived NC. Mathematical Systems Theory, 20:13–29, 1987.

    Google Scholar 

  18. C. Wilson. On the decomposability of NC and AC. SIAM Journal on Computing, 19(2):384–296, April 1990.

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Editor information

Patrice Enjalbert Ernst W. Mayr Klaus W. Wagner

Rights and permissions

Reprints and permissions

Copyright information

© 1994 Springer-Verlag Berlin Heidelberg

About this paper

Cite this paper

Ogiwara, M. (1994). NCk(NP)=ACk−1(NP). In: Enjalbert, P., Mayr, E.W., Wagner, K.W. (eds) STACS 94. STACS 1994. Lecture Notes in Computer Science, vol 775. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-57785-8_151

Download citation

  • DOI: https://doi.org/10.1007/3-540-57785-8_151

  • Published:

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-57785-0

  • Online ISBN: 978-3-540-48332-8

  • eBook Packages: Springer Book Archive

Publish with us

Policies and ethics