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19th Annual IEEE Conference on Computational Complexity (CCC'04)
Polylogarithmic-Round Interactive Proofs for coNP Collapse the Exponential Hierarchy
Amherst, Massachusetts
June 21-June 24
ISBN: 0-7695-2120-7
Alan L. Selman, University at Buffalo
Samik Sengupta, University at Buffalo

It is known [BHZ87] that if every language in coNP has a constant-round interactive proof system, then the polynomial hierarchy collapses. On the other hand, Lund et al. [LFKN92] have shown that #SAT, the #P-complete function that outputs the number of satisfying assignments of a Boolean formula, can be computed by a linear-round interactive protocol. As a consequence, the coNP-complete set \overline {SAT} has a proof system with linear rounds of interaction.

We show that if every set in coNP has a polylogarithmic-round interactive protocol then the exponential hierarchy collapses to the third level. In order to prove this, we obtain an exponential version of Yap?s result [Yap83], and improve upon an exponential version of the Karp-Lipton theorem [KL80], obtained first by Buhrman and Homer [BH92].

Citation:
Alan L. Selman, Samik Sengupta, "Polylogarithmic-Round Interactive Proofs for coNP Collapse the Exponential Hierarchy," ccc, pp.82-90, 19th Annual IEEE Conference on Computational Complexity (CCC'04), 2004
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