Log-rank and lifting for AND-functions

Log-rank and lifting for AND-functions
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AND 函数的对数排序和提升

DOI:
10.1145/3406325.3450999
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发表时间:
2021
期刊:
Proceedings of the 53rd Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
--
通讯作者:
Yuan, Weiqiang
Yuan, Weiqiang
中科院分区:
--
文献类型:
--
作者:
Knop, Alexander;Lovett, Shachar;McGuire, Sam;Yuan, Weiqiang

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设f:{0,1}n→ {0,1}是一个布尔函数,并且letf(x,y)=f(x y)表示AND函数off,其中x y表示逐位AND。我们研究的确定性通信复杂性关闭的,并表明,到一个logn因子,它是有界的多项式在对数的通信矩阵关闭的真实的秩。这是在一个logn因子内建立对数秩猜想的AND-函数,而没有任何限制。我们的结果与以往的结果相比,对数秩猜想的特殊情况下,需要显着的限制f,如单调性或低F2-度。我们的技术也可以用来证明(在一个logn因子)alifting定理的AND-功能,说明确定性的通信复杂性关闭的是多项式相关的AND-决策树的复杂性关闭。结果依赖于一个新的结构性的结果,布尔函数sf:{0,1}n→ {0,1}与稀疏多项式表示,这可能是独立的利益。我们表明,如果多项式computingf有几个单项式,那么单项式的集合系统有一个小的命中集,其稀疏性的大小poly-logarithmic。我们还建立了这个结果的推广到多线性多项式sf:{0,1}n→具有更大的范围。
Letf: {0, 1}n→ {0, 1} be a boolean function, and letf∧(x,y) =f(x∧y) denote theAND-functionoff, wherex∧ydenotes bit-wise AND. We study the deterministic communication complexity off∧and show that, up to a lognfactor, it is bounded by a polynomial in the logarithm of the real rank of the communication matrix off∧. This comes within a lognfactor of establishing the log-rank conjecture for AND-functions withno assumptionsonf. Our result stands in contrast with previous results on special cases of the log-rank conjecture, which needed significant restrictions onfsuch as monotonicity or low F2-degree. Our techniques can also be used to prove (within a lognfactor) alifting theoremfor AND-functions, stating that the deterministic communication complexity off∧is polynomially related to theAND-decision tree complexityoff.The results rely on a new structural result regarding boolean functionsf: {0, 1}n→ {0, 1} with a sparse polynomial representation, which may be of independent interest. We show that if the polynomial computingfhas few monomials then the set system of the monomials has a small hitting set, of size poly-logarithmic in its sparsity. We also establish extensions of this result to multi-linear polynomialsf: {0, 1}n→ with a larger range.
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