XOR lemmas for resilient functions against polynomials

XOR lemmas for resilient functions against polynomials
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针对多项式的弹性函数的异或引理

DOI:
10.1145/3357713.3384242
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发表时间:
2020
期刊:
52nd Annual ACM Symposium on Theory of Computing (STOC
影响因子:
--
通讯作者:
Zuckerman, David
Zuckerman, David
中科院分区:
--
文献类型:
--
作者:
Chattopadhyay, Eshan;Hatami, Pooya;Hosseini, Kaave;Lovett, Shachar;Zuckerman, David

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复杂性理论中的一个主要挑战是显式地构造与F2上的低次多项式具有小相关性的函数。我们介绍了一种新的技术来证明这样的F2多项式的相关界。使用这种技术,我们绑定的相关性的异或的多数与常次数多项式。事实上,我们证明了一个更一般的XOR引理,扩展到任意弹性功能。我们猜想该方法也可以推广到高阶多项式,其中的一个关键部分是关于F2上低次多项式Fourier谱的结构性结果.我们证明了对于任意n元多项式F2的次数至多为d,存在一个小的变量集S ∈ [n],使得几乎所有的傅立叶质量都在与S相交的傅立叶系数上。事实上,我们的结果是更一般的,并发现这样的集合S的任何低维子空间的多项式。这种普遍性在推导新的XOR引理时是至关重要的。
A major challenge in complexity theory is to explicitly construct functions that have small correlation with low-degree polynomials over F2. We introduce a new technique to prove such correlation bounds with F2polynomials. Using this technique, we bound the correlation of an XOR of Majorities with constant degree polynomials. In fact, we prove a more general XOR lemma that extends to arbitrary resilient functions. We conjecture that the technique generalizes to higher degree polynomials as well.A key ingredient in our new approach is a structural result about the Fourier spectrum of low degree polynomials over F2. We show that for anyn-variate polynomialpover F2of degree at mostd, there is a small setS⊂ [n] of variables, such that almost all of the Fourier mass ofplies on Fourier coefficients that intersect withS. In fact our result is more general, and finds such a setSfor any low-dimensional subspace of polynomials. This generality is crucial in deriving the new XOR lemmas.
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DOI: --
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