Elementary estimates for a certain typeof Soto-Andrade sum
HTML articles powered by AMS MathViewer
- by Imin Chen
- Proc. Amer. Math. Soc. 128 (2000), 1933-1939
- DOI: https://doi.org/10.1090/S0002-9939-00-05591-X
- Published electronically: February 21, 2000
- PDF | Request permission
Abstract:
This paper shows that a certain type of Soto-Andrade sum can be estimated in an elementary way which does not use the Riemann hypothesis for curves over finite fields and which slightly sharpens previous estimates for this type of Soto-Andrade sum. As an application, we discuss how this implies that certain graphs arising from finite upper half planes in odd characteristic are Ramanujan without using the Riemann hypothesis.References
- Nancy Celniker, Steven Poulos, Audrey Terras, Cindy Trimble, and Elinor Velasquez, Is there life on finite upper half planes?, A tribute to Emil Grosswald: number theory and related analysis, Contemp. Math., vol. 143, Amer. Math. Soc., Providence, RI, 1993, pp. 65–88. MR 1210513, DOI 10.1090/conm/143/00991
- Nicholas M. Katz, Estimates for Soto-Andrade sums, J. Reine Angew. Math. 438 (1993), 143–161. MR 1215651, DOI 10.1515/crll.1993.438.143
- Wen-Ch’ing Winnie Li. Number-theoretic constructions of ramanujan graphs. Astérisque, 3-4(228):101–120, 1995.
- Wen-Ching Winnie Li. Estimates of character sums arising from finite upper half planes. In Cohen S. and Niederreiter H., editors, Finite fields and applications (Glasgow, 1995), number 233 in London Mathematical Society Lecture Notes. Cambridge University Press, 1996.
- Yoshiaki Sawabe, Legendre character sums, Hiroshima Math. J. 22 (1992), no. 1, 15–22. MR 1160036
- J. Soto-Andrade. Geometrical Gelfand models, tensor quotients, and Weil representations. In Proceedings of Symposia in Pure Mathematics, volume 47, pages 305–316, 1987.
- A. Terras. Are finite upper half plane graphs Ramanujan? In Expanding Graphs (Princeton, NJ, 1992), volume 10 of DIMACS Series in Discrete Mathematics and Theoretical Computer Science, pages 125–142. American Mathematical Society, Providence, RI, 1993.
- Morgan Ward, Ring homomorphisms which are also lattice homomorphisms, Amer. J. Math. 61 (1939), 783–787. MR 10, DOI 10.2307/2371336
Bibliographic Information
- Imin Chen
- Affiliation: Department of Mathematics and Statistics, McGill University, Montreal, Quebec, Canada H3A 2K6
- MR Author ID: 609304
- Email: chen@math.mcgill.ca
- Received by editor(s): September 8, 1998
- Published electronically: February 21, 2000
- Additional Notes: This research was supported by an NSERC postdoctoral fellowship and a grant from CICMA
- Communicated by: David E. Rohrlich
- © Copyright 2000 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 128 (2000), 1933-1939
- MSC (2000): Primary 11L40; Secondary 05C25, 20G40
- DOI: https://doi.org/10.1090/S0002-9939-00-05591-X
- MathSciNet review: 1707143