Sur la complexité de familles d’ensembles pseudo-aléatoires
[On the complexity of families of pseudo-random subsets]
Annales de l'Institut Fourier, Volume 64 (2014) no. 1, pp. 267-296.

In this paper we are interested in the following problem. Let p be a prime number, S𝔽 p and 𝒫{P𝔽 p [X]:degPd}. What is the largest integer k such that for all subsets 𝒜, of 𝔽 p satisfying 𝒜= and |𝒜|=k, there exists P𝒫 such that P(x)S if x𝒜 and P(x)S if x? This problem corresponds to the study of the complexity of some families of pseudo-random subsets. First we recall this complexity definition and the context of pseudo-random subsets. Then we state the different results we have obtained according to the shape of the sets S and 𝒫 considered. Some proofs are based on upper bounds for exponential sums or characters sums in finite fields, other proofs use combinatorics and additive number theory.

Dans cet article, on s’intéresse au problème suivant. Soient p un nombre premier, S𝔽 p et 𝒫{P𝔽 p [X]:degPd}. Quel est le plus grand entier k tel que pour toutes paires de sous-ensembles disjoints 𝒜, de 𝔽 p vérifiant |𝒜|=k, il existe P𝒫 tel que P(x)S si x𝒜 et P(x)S si x  ? Ce problème correspond à l’étude de la complexité de certaines familles d’ensembles pseudo-aléatoires. Dans un premier temps, nous rappelons la définition de cette complexité et resituons le contexte des ensembles pseudo-aléatoires. Ensuite, nous exposons les différents résultats obtenus selon la nature des ensembles S et 𝒫 étudiés. Certaines preuves passent par des majorations de sommes d’exponentielles ou de caractères sur des corps finis, d’autres combinent des arguments combinatoires avec des résultats de la théorie additive des nombres.

DOI: 10.5802/aif.2847
Classification: 11K45, 11L07, 05B10
Mot clés : Sous-ensembles pseudo-aléatoires, complexité, sommes d’exponentielles, sommes de caractères
Keywords: pseudo-random subsets, complexity, exponential sums, character sums

Balasubramanian, Ramachandran 1; Dartyge, Cécile 2; Mosaki, Élie 3

1 Institute of Mathematical Sciences C.I.T. Campus Taramani, Chennai 600113 (India)
2 Université de Lorraine Institut Élie Cartan BP 70239 54506 Vandœuvre-lès-Nancy Cedex (France)
3 Université de Lyon Université Lyon 1 Institut Camille Jordan CNRS UMR 5208 43, boulevard du 11 Novembre 1918 69622 Villeurbanne (France)
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Balasubramanian, Ramachandran; Dartyge, Cécile; Mosaki,  Élie. Sur la complexité de familles d’ensembles pseudo-aléatoires. Annales de l'Institut Fourier, Volume 64 (2014) no. 1, pp. 267-296. doi : 10.5802/aif.2847. https://aif.centre-mersenne.org/articles/10.5802/aif.2847/

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