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arXiv 2607.25711math.NTmath.CO

乘法子群不是限制和集

Multiplicative subgroups are not restricted sumsets

Chi Hoi Yip, Semin Yoo

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中文总结 AI 辅助

研究素域中哪些真乘法子群可表示为特定形式的限制和集,证明\(|H|\geq7\)时不满足,\(|H|\in\{1,3,6\}\)时存在并分类,解决了广义Sárközy猜想限制和集类似问题,扩展细化前人结果。

中文摘要 AI 辅助

我们确切地确定了素域的哪些真乘法子群可以表示为\(A\mathbin{\widehat{+}} A=\{a + a':a,a'\in A,a\neq a'\}\)形式的限制和集。我们证明,当\(|H|\geq7\)时,真乘法子群\(H\leq\mathbb{F}_p^*\)不能满足\(H = A\mathbin{\widehat{+}} A\),且这个阈值是精确的。实际上,当\(|H|\in\{1,3,6\}\)时这种分解才存在,我们对这些特殊情况下的所有分解进行了分类。这给出了素域上广义Sárközy猜想的限制和集类似问题的精确、完整解答,显著扩展和细化了Shkredov和Yip之前的结果。

英文摘要

We determine exactly which proper multiplicative subgroups of a prime field can be represented as a restricted sumset of the form $A\mathbin{\widehat{+}} A=\{a+a':a,a'\in A,\ a\ne a'\}$. We prove that a proper multiplicative subgroup $H\le\mathbb F_p^*$ cannot satisfy $H=A\mathbin{\widehat{+}} A$ whenever $|H|\ge7$, and that this threshold is sharp. In fact, such a decomposition exists precisely when $|H|\in\{1,3,6\}$, and we classify all decompositions in these exceptional cases. This gives a sharp, complete resolution of the restricted-sumset analogue of the generalized Sárközy conjecture over prime fields. This significantly extends and refines previous results of Shkredov and Yip.

发表机构

  • Hong Kong University of Science and Technology(香港科技大学)
  • Institute for Basic Science(韩国基础科学研究院)

机构由 AI 辅助整理,请以论文原文为准。

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