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Slightly improved sum-product estimates in fields of prime order

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arxiv 0907.2051 v1 pith:IH2BQ33U submitted 2009-07-12 math.NT math.CO

Slightly improved sum-product estimates in fields of prime order

classification math.NT math.CO
keywords estimatesfracmathbbprimeslightlysucceqsum-productthen
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abstract

Let $\mathbb{F}_p$ be the field of residue classes modulo a prime number $p$ and let $A$ be a nonempty subset of $\mathbb{F}_p$. In this paper we show that if $|A|\preceq p^{0.5}$, then \[ \max\{|A\pm A|,|AA|\}\succeq|A|^{13/12};\] if $|A|\succeq p^{0.5}$, then \[ \max\{|A\pm A|,|AA|\}\succapprox \min\{|A|^{13/12}(\frac{|A|}{p^{0.5}})^{1/12},|A|(\frac{p}{|A|})^{1/11}\}.\] These results slightly improve the estimates of Bourgain-Garaev and Shen. Sum-product estimates on different sets are also considered.

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