首页> 外文会议>Foundations of Computer Science, 1992. Proceedings., 33rd Annual Symposium on >Mick gets some (the odds are on his side) (satisfiability)
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Mick gets some (the odds are on his side) (satisfiability)

机译:米克得到一些(赔率就在他身边)(满足)

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Consider a randomly generated boolean formula F (in the conjunctive normal form) with m clauses of size k over n variables; k is fixed at any value greater than 1, but n tends to infinity and m = (1 + o(1))cn for some c depending only on k. It is easy to see that F is unsatisfiable with probability 1-o(1) whenever c<(ln 2)2/sup k/; the authors complement this observation by proving that F is satisfiable with probability 1-o(1) whenever c>(0.25)2/sup k//k; in fact, they present a linear-time algorithm that satisfies F with probability 1-o(1). In addition, they establish a threshold for 2-SAT: if k = 2 then F is satisfiable with probability 1-o(1) whenever c>1 and unsatisfiable with probability 1-o(1) whenever c<1.
机译:考虑一个随机生成的布尔公式F(合取范式),在n个变量上具有m个大小为k的子句; k固定为任何大于1的值,但对于某些c,n趋于无穷大,并且m =(1 + o(1))cn仅取决于k。容易看出,每当c <(ln 2)2 / sup k /;时,F的概率为1-o(1)是不满足的。作者证明,只要c>(0.25)2 / sup k // k,F的概率就可以满足1-o(1)。实际上,他们提出了一种线性时间算法,该算法以1o(1)的概率满足F。此外,它们为2-SAT建立阈值:如果k = 2,则无论何时c> 1,F的概率为1-o(1),而当c <1的F的概率为1-o(1)。

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