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arXiv 2608.17365math.COcs.CC

针对部分受限三元算术 progression(3-AP)的计数引理

A Counting Lemma for Somewhat Restricted 3-APs

Amey Bhangale, Subhash Khot, Yang P. Liu, Dor Minzer

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中文总结 AI 辅助

该研究针对有限域向量空间F_p^n中的部分受限三元算术 progression(3-AP),结合Bhangale等人的工具,提出并证明了适用于稠密集合的计数引理,丰富了算术正则性引理相关理论。

中文摘要 AI 辅助

对于素数p≥3,有限域向量空间F_p^n中的部分受限三元算术 progression(3-AP)是形如(x, x+a, x+2a)的三元组,其中x∈F_p^n,a∈{0,1,2}^n。我们证明了F_p^n中稠密集合内部分受限3-AP的计数引理。更确切地说,我们证明:对任意α>0,存在β>0,使得当n足够大时,若集合A⊆F_p^n的密度至少为α,则A包含至少β比例的所有部分受限3-AP。我们的证明基于Bhangale、Khot、Minzer(2026)近期开发的工具,主要新内容是针对部分受限3-AP这类模式的算术正则性引理,该结果遵循Gowers一致性范数理论中Green和Tao(2010)的算术正则性引理的思路,可能具有独立研究价值。

英文摘要

For a prime $p\geq 3$, a somewhat restricted $3$-AP in $\mathbb{F}_p^n$ is a triplet $(x,x+a,x+2a)$, where $x\in\mathbb{F}_p^n$ and $a\in \{0,1,2\}^n$. We prove a counting lemma for somewhat restricted $3$-APs in dense sets in $\mathbb{F}_p^n$. More precisely, we prove that for all $α>0$, there exists $β>0$, such that for sufficiently large $n$, if a set $A\subseteq \mathbb{F}_p^n$ has density at least $α$, then it contains at least $β$ fraction of all somewhat restricted $3$-APs. Our proof builds on recently developed machinery from [Bhangale, Khot, Minzer, 2026]. Our main new ingredient is an arithmetic regularity lemma for patterns such as somewhat restricted 3-APs. This result is in the spirit of arithmetic regularity lemmas from the theory of Gowers uniformity norms [Green, Tao, 2010] and may be of independent interest.

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