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首页> 外文期刊>Israel Journal of Mathematics >Chowla’s cosine problem
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Chowla’s cosine problem

机译:乔拉的余弦问题

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摘要

Suppose that G is a discrete abelian group and A ⊂ G is a finite symmetric set. We show two main results. (i) Either there is a Jset H of O(log c |A|) subgroups of G with |AΔ∪H| = o(|A|) where ∪H = ∪ H∈H H, or there is a character γ ∈ $gamma in mathord{buildrel{lower3pthbox{$gamma in mathord{buildrel{lower3pthbox{ such that $ - {{mathord{buildrel{lower3pthbox{$ - {{mathord{buildrel{lower3pthbox{ where c > 0 is the same absolute constant.
机译:假设G是一个离散阿贝尔群,而A⊂G是一个有限对称集。我们显示了两个主要结果。 (i)要么是G的O(log c | A |)个子组的Jset H,其|AΔ∪H| = o(| A |),其中∪H=∪H∈H H,或者在mathord {buildrel {lower3pthbox {$ gamma在mathord {buildrel {lower3pthbox { $-{{mathord {buildrel {lower3pthbox {}-$ {{mathord {buildrel {lower3pthbox {其中c> 0是相同的绝对常数。

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