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Some consequences of non-uniform conditions on uniform classes. (English) Zbl 0541.68017
Non-uniform complexity classes appear from the circuit complexity. It is proved that if non-uniform classes \(\Sigma_ i/poly=\Pi_ i/poly,\) then \(\Sigma_{i+2}=\Pi_{i+2}\) in the Meyer-Stockmeyer hierarchy. Apart that, some connections between coincidence of complexity classes and sparse complete sets are ascertained. If there exists a sparse set which is complete for co-NP relatively to conjunctive reducibility then \(P=NP\). Besides that, if NP is conjunctively and disjunctively reducible to a sparse NP-complete set then also \(P=NP\).
Reviewer: D.Yu Grigorev

68Q25 Analysis of algorithms and problem complexity
03D15 Complexity of computation (including implicit computational complexity)
Full Text: DOI
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