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arXiv 0904.0157math.PRmath.CO
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一致低次函数的噪声相关界

Noise Correlation Bounds for Uniform Low Degree Functions

Per Austrin, Elchanan Mossel

摘要:

研究了两两独立分布下无大傅里叶系数的函数的相关界。其中所有傅里叶系数都以$δ$为界的函数称为$δ$ -{ \em uniform}。搜索这样的界限的动机是他们的潜在适用性的硬度近似,去随机化,和添加剂组合。在我们的主要结果中,我们表明,$\E[f_1(X_1^1,...,X_1^n) ... f_k(X_k^1,...,X_k^n)]$是接近于0,在以下假设:1。矢量$\{(X_1^j,...,X_k^j) : 1 \leq j \leq n\}$是独立同分布的,并且对于每个$j$,矢量$(X_1^j,...,X_k^j)$具有成对独立分布。2.函数$f_i$是统一的。3. $f_i$功能等级较低。我们比较我们的结果与第二作者最近的结果低影响函数和最近的结果添加剂组合使用Gowers规范。我们的证明扩展了一些技术从超压缩性理论的多线性设置。

英文摘要:

We study correlation bounds under pairwise independent distributions for functions with no large Fourier coefficients. Functions in which all Fourier coefficients are bounded by $δ$ are called $δ$-{\em uniform}. The search for such bounds is motivated by their potential applicability to hardness of approximation, derandomization, and additive combinatorics. In our main result we show that $\E[f_1(X_1^1,...,X_1^n) ... f_k(X_k^1,...,X_k^n)]$ is close to 0 under the following assumptions: 1. The vectors $\{(X_1^j,...,X_k^j) : 1 \leq j \leq n\}$ are i.i.d, and for each $j$ the vector $(X_1^j,...,X_k^j)$ has a pairwise independent distribution. 2. The functions $f_i$ are uniform. 3. The functions $f_i$ are of low degree. We compare our result with recent results by the second author for low influence functions and to recent results in additive combinatorics using the Gowers norm. Our proofs extend some techniques from the theory of hypercontractivity to a multilinear setup.

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