Abstract
In line with classical work by Hardy, Littlewood and Wilton, we study a class of functional equations involving the Gauss transformation from the theory of continued fractions. This allows us to reprove, among others, a convergence criterion for a diophantine series considered by Chowla, and to give additional information about the sum of this series.
Similar content being viewed by others
References
Báez-Duarte, L., Balazard, M., Landreau, B., Saias, E.: Étude de l’autocorrélation multiplicative de la fonction partie fractionnaire. Ramanujan J. 9, 215–240 (2005)
Balazard, M., Martin, B.: Comportement local moyen de la fonction de Brjuno. Fund. Math. 218, 193–224 (2012)
Balazard, M., Martin, B.: Sur l’autocorrélation multiplicative de la fonction partie fractionnaire et une fonction définie par J. R. Wilton, https://hal.archives-ouvertes.fr/hal-00823899v1, 57 pp (2013)
Balazard, M., Martin, B.: Sur une équation fonctionnelle approchée due à J. R. Wilton. Mosc. Math. J. 15, 629–652 (2015)
Bettin, S.: On the distribution of a cotangent sum. Int. Math. Res. Not. IMRN 21, 11419–11432 (2015)
Cayley, A.: Eisenstein’s geometrical proof of the fundamental theorem for quadratic residues. Q. J. Pure Appl. Maths 1, 186–192 (1857)
Chandrasekharan, K., Narasimhan, R.: An approximate reciprocity formula for some exponential sums. Comment. Math. Helv. 43, 296–310 (1968)
Choimet, D., Queffélec, H.: Analyse mathématique, grands théorèmes du vingtième siècle. Calvage & Mounet, Paris (2009)
Chowla, S.: Note on a trigonometric sum. J. Lond. Math. Soc. 5, 176–178 (1930)
Chowla, S.: Some problems of diophantine approximation (I). Math. Z. 1, 544–563 (1931)
de la Bretèche, R., Tenenbaum, G.: Séries trigonométriques à coefficients arithmétiques. J. Anal. Math. 92, 1–79 (2004)
de la Bretèche, R., Tenenbaum, G.: Dérivabilité ponctuelle d’une intégrale liée aux fonctions de Bernoulli. Proc. Am. Math. Soc. 143, 4791–4796 (2015)
Eisenstein, G.: Geometrischer Beweis des Fundamentaltheorems für die quadratischen Reste. J. Reine Angew. Math. 28, 246–248 (1844)
Gauss, C.F.: Theorematis arithmetici demonstratio nova. Comm. Soc. regiae Sci. Gottingensis Class. Math. 16, 69–74 (1808)
Hardy, G.H., Littlewood, J.E.: Some problems of diophantine approximation. Acta Math. 37, 155–239 (1914)
Maier, H., Rassias, M.T.: Asymptotics for moments of certain cotangent sums. Houston J. Math. 43, 207–222 (2017)
Maier, H., Rassias, M.T.: Asymptotics for moments of certain cotangent sums for arbitrary exponents. Houston J. Math. 43, 1235–1249 (2017)
Mordell, L.J.: The approximate functional formula for the theta function. J. Lond. Math. Soc. S1–1, 68–72 (1926)
Oppenheim, A.: The approximate functional equation for the multiple theta-function and the trigonometric sums associated therewith. Proc. Lond. Math. Soc. S2–28, 476–483 (1928)
Oskolkov, K.I.: The series \(\Sigma \Sigma \frac{e^{2\pi imnx}}{mn}\) and Chowla’s problem. Proc. Steklov Inst. Mat. 248, 197–215 (2005)
Rivoal, T.: On the convergence of Diophantine Dirichlet series. Proc. Edinb. Math. Soc. 55(2), 513–541 (2012)
Rivoal, T., Roques, J.: Convergence and modular type properties of a twisted riemann series. Uniform Distrib. Theory 8, 97–119 (2013)
Rivoal, T., Seuret, S.: Hardy-Littlewood series and even continued fractions. J. Anal. Math. 125, 175–225 (2015)
Sylvester, J.J.: Sur la fonction \(E(x)\). C.R.A.S. Paris 50, 732–734 (1860)
van der Corput, J.G.: Über Summen, die mit den elliptischen \(\vartheta \)-Funktionen zusammenhängen. Math. Ann. 87, 66–77 (1922)
Yoccoz, J.-C.: Théorème de Siegel, nombres de Bruno et polynômes quadratiques. Astérisque 231, 3–88 (1995) (Petits diviseurs en dimension 1)
Walfisz, A.: Über einige trigonometrische Summen. Math. Z. 33, 564–601 (1931)
Wilton, J.R.: The approximate functional formula for the theta function. J. Lond. Math. Soc. S1–2(3), 177–180 (1927)
Wilton, J.R.: An approximate functional equation with applications to a problem of diophantine approximation. J. Reine Angew. Math 169, 219–237 (1933)
Acknowledgements
Outre leurs laboratoires respectifs, les auteurs remercient les UMI 2615 (CNRS-UIM, Moscou) et 3457 (CNRS-CRM, Montréal), qui ont fourni des conditions idéales pour leur travail sur cet article.
Author information
Authors and Affiliations
Corresponding author
Additional information
Bruno Martin is supported by ANR Grant MUDERA ANR-14-CE34-0009.
Rights and permissions
About this article
Cite this article
Balazard, M., Martin, B. Sur certaines équations fonctionnelles approchées, liées à la transformation de Gauss. Aequat. Math. 93, 563–585 (2019). https://doi.org/10.1007/s00010-018-0594-z
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00010-018-0594-z