arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.09963math.COmath.CAmath.NT
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关于最大无和整数集的一个注记

A note on the largest sum-free sets of integers

Yifan Jing, Shukun Wu

AI总结:

本文研究加性组合数学中正整数集无和子集大小问题,通过引入对宿主集合A的结构分析,直接证明了对于每个k≥1,(2k,4k)-无和集存在类似最大无和子集的现象。

摘要:

给定一个包含N个正整数的集合A,加性组合数学中的一个古老问题询问A是否包含一个大小至少为N/3+ω(N)的无和子集,其中ω为某个递增的无界函数。文献中通常通过考虑另一个猜想来研究该问题,该猜想断言当N→∞时,max_{x∈R/Z}∑_{n∈A}(1_{(1/3,2/3)}-1/3)(nx)→∞。若该猜想成立,也将意味着对于每个k≥1,(2k,4k)-无和集都会出现类似现象。在本注记中,我们直接证明了后一结果。我们证明的新要素是对宿主集合A的结构分析,这可能具有独立的研究价值。

英文摘要:

Given $A$ a set of $N$ positive integers, an old question in additive combinatorics asks that whether $A$ contains a sum-free subset of size at least $N/3+ω(N)$ for some increasing unbounded function $ω$. The question is generally attacked in the literature by considering another conjecture, which asserts that as $N\to\infty$, $\max_{x\in\mathbb{R}/\mathbb{Z}}\sum_{n\in A}({\bf 1}_{(1/3,2/3)}-1/3)(nx)\to\infty$. This conjecture, if true, would also imply that a similar phenomenon occurs for $(2k,4k)$-sum-free sets for every $k\geq1$. In this note, we prove the latter result directly. The new ingredient of our proof is a structural analysis on the host set $A$, which might be of independent interest.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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