Geodesic
Sums of multiplicative characters with additive convolutions
Informatics and Automation, Analytic and combinatorial number theory, Tome 296 (2017), pp. 265-279.

Voir la notice de l'article provenant de la source Math-Net.Ru

We obtain new estimates for binary and ternary sums of multiplicative characters with additive convolutions of characteristic functions of sets with small additive doubling. In particular, we improve a result of Mei-Chu Chang. The proof uses the Croot–Sisask almost periodicity lemma. 
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A. S. Volostnov; I. D. Shkredov. Sums of multiplicative characters with additive convolutions. Informatics and Automation, Analytic and combinatorial number theory, Tome 296 (2017), pp. 265-279. http://geodesic.mathdoc.fr/item/TRSPY_2017_296_a20/

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