Abstract
The notion of NP-completeness has cut across many fields and has provided a means of identifying deep and unexpected commonalities. Problems from areas as diverse as combinatorics, logic, and operations research turn out to be NP-complete and thus computationally equivalent in the sense discussed in the next paragraph. PSPACE-completeness, NEXP-completeness, and completeness for other complexity classes have likewise been used to show commonalities in a variety of other problems. This paper surveys investigations into how strong these commonalities are.
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Kurtz, S.A., Mahaney, S.R., Royer, J.S. (1990). The Structure of Complete Degrees. In: Selman, A.L. (eds) Complexity Theory Retrospective. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4478-3_7
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DOI: https://doi.org/10.1007/978-1-4612-4478-3_7
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