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Journal of the American Mathematical Society

Published by the American Mathematical Society, the Journal of the American Mathematical Society (JAMS) is devoted to research articles of the highest quality in all areas of pure and applied mathematics.

ISSN 1088-6834 (online) ISSN 0894-0347 (print)

The 2020 MCQ for Journal of the American Mathematical Society is 4.79.

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Mordell’s exponential sum estimate revisited
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by J. Bourgain PDF
J. Amer. Math. Soc. 18 (2005), 477-499 Request permission


The aim of this paper is to extend recent work of S. Konyagin and the author on Gauss sum estimates for large degree to the case of ‘sparse’ polynomials. In this context we do obtain a nearly optimal result, improving on the works of Mordell and of Cochrane and Pinner. The result is optimal in terms of providing some power gain under conditions on the exponents in the polynomial that are best possible if we allow arbitrary coefficients. As in earlier work referred to above, our main combinatorial tool is a sum-product theorem. Here we need a version for product spaces $\mathbb {F}_{p}\times \mathbb {F}_{p}$ for which the formulation is obviously not as simple as in the $\mathbb {F}_{p}$-case. Again, the method applies more generally to provide nontrivial bounds on (possibly incomplete) exponential sums involving exponential functions. At the end of the paper, some applications of these are given to issues of uniform distribution for power generators in cryptography.
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Additional Information
  • J. Bourgain
  • Affiliation: School of Mathematics, Institute for Advanced Study, Princeton, New Jersey 08540
  • MR Author ID: 40280
  • Received by editor(s): July 16, 2004
  • Published electronically: January 18, 2005
  • © Copyright 2005 American Mathematical Society
  • Journal: J. Amer. Math. Soc. 18 (2005), 477-499
  • MSC (2000): Primary 11L07; Secondary 11T23
  • DOI:
  • MathSciNet review: 2137982