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• W2952623436 abstract "Many NP-complete constraint satisfaction problems appear to undergo a phase transition'' from solubility to insolubility when the constraint density passes through a critical threshold. In all such cases it is easy to derive upper bounds on the location of the threshold by showing that above a certain density the first moment (expectation) of the number of solutions tends to zero. We show that in the case of certain symmetric constraints, considering the second moment of the number of solutions yields nearly matching lower bounds for the location of the threshold. Specifically, we prove that the threshold for both random hypergraph 2-colorability (Property B) and random Not-All-Equal k-SAT is 2^{k-1} ln 2 -O(1). As a corollary, we establish that the threshold for random k-SAT is of order Theta(2^k), resolving a long-standing open problem." @default.
• W2952623436 created "2019-06-27" @default.
• W2952623436 creator A5008033989 @default.
• W2952623436 creator A5021300666 @default.
• W2952623436 date "2003-10-09" @default.
• W2952623436 modified "2023-09-27" @default.
• W2952623436 title "Random k-SAT: Two Moments Suffice to Cross a Sharp Threshold" @default.
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• W2952623436 hasPublicationYear "2003" @default.
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