arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.04322math.NT
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乘逆闭的和自由集

Sum-free sets which are closed under multiplicative inverses

Katherine Benjamin

摘要:

设$A$是有限域$\mathbb{F}$的子集。当$\mathbb{F}$具有素数阶时,证明了存在一个绝对常数$c > 0$,使得如果$A$是无和的且等于其乘法逆的集合,则$|A| < (0.25 - c)|\mathbb{F}| + o(|\mathbb{F}|)$为$|\mathbb{F}| \rightarrow \infty$ .我们将此与当$\mathbb{F}$具有特征性$2$时这样的集合存在大小至少为$0.25|\mathbb{F}| - o(|\mathbb{F}|)$的结果进行对比。

英文摘要:

Let $A$ be a subset of a finite field $\mathbb{F}$. When $\mathbb{F}$ has prime order, we show that there is an absolute constant $c > 0$ such that, if $A$ is both sum-free and equal to the set of its multiplicative inverses, then $|A| < (0.25 - c)|\mathbb{F}| + o(|\mathbb{F}|)$ as $|\mathbb{F}| \rightarrow \infty$. We contrast this with the result that such sets exist with size at least $0.25|\mathbb{F}| - o(|\mathbb{F}|)$ when $\mathbb{F}$ has characteristic $2$.

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