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A sum-product estimate in finite fields,and applications
Authors:Jean Bourgain  Nets Katz  Terence Tao
Institution:(1) School of Mathematics, Institute of Advanced Study, Princeton, NJ 08540, USA;(2) Department of Mathematics, Washington University in St. Louis, St. Louis, MO 63130, USA;(3) Department of Mathematics, UCLA, Los Angeles, CA 90095-1555, USA
Abstract:Let A be a subset of a finite field $$ F := \mathbf{Z}/q\mathbf{Z} $$ for some prime q. If $$ |F|^{\delta} < |A| < |F|^{1-\delta} $$ for some delta > 0, then we prove the estimate $$ |A + A| + |A \cdot A| \geq c(\delta)|A|^{1+\varepsilon} $$ for some epsi = epsi(delta) > 0. This is a finite field analogue of a result of ErS]. We then use this estimate to prove a Szemerédi-Trotter type theorem in finite fields, and obtain a new estimate for the Erdös distance problem in finite fields, as well as the three-dimensional Kakeya problem in finite fields.
Keywords:((no ))
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