两两独立的平方和下界

B. Barak, S. Chan, Pravesh Kothari
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引用次数: 47

摘要

证明了对于每一个ε>0且支持两两独立分布的谓词P:{0,1}k->{0,1},存在n个变量的最大P约束满足问题的实例I,使得任何赋值都不能满足I的约束大于1 ~(|P-1(1)|)/(2k)+ε分数,但Ω(n)平方和半定规划层次不能证明I是不可满足的。类似的结果以前只在较弱的等级制度中发现。
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Sum of Squares Lower Bounds from Pairwise Independence
We prove that for every ε>0 and predicate P:{0,1}k-> {0,1} that supports a pairwise independent distribution, there exists an instance I of the Max P constraint satisfaction problem on n variables such that no assignment can satisfy more than a ~(|P-1(1)|)/(2k)+ε fraction of I's constraints but the degree Ω(n) Sum of Squares semidefinite programming hierarchy cannot certify that I is unsatisfiable. Similar results were previously only known for weaker hierarchies.
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