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Information Processing Letters
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Symmetric alternation captures BPP
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FOCS '99 Proceedings of the 40th Annual Symposium on Foundations of Computer Science
A complexity theoretic approach to randomness
STOC '83 Proceedings of the fifteenth annual ACM symposium on Theory of computing
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It is known that ${{\rm S}_2^p} \subseteq {{{\rm ZPP}}^{{\rm NP}}}$ [3]. The reverse direction of whether ZPPNP is contained in S$_{\rm 2}^{p}$ remains open. We show that if the zero-error algorithm is allowed to ask only one query to the NP oracle (for any input and random string), then it can be simulated in S$_{\rm 2}^{p}$. That is, we prove that ${{{\rm ZPP}}^{{\rm NP}[1]}} \subseteq {{\rm S}_2^p}$.