The Sum of Dirichlet Characters of a Polynomial Over a Reduced Residue System / V.N. Chubarikov // Vestn. Mosk. Univ., Matem. Mekhan. 2009. № 3. P. 40-43 [Moscow Univ. Math. Bulletin. Vol. 64, No 3, 2009. P. 129-131]
A root estimate is obtained for a sum of Dirichlet characters of the polynomial axn+b over a reduced residue system.
Key words: Dirichlet character, Postnikov's formula for a Dirichlet character,
Hua Loo-keng's method for estimation of complete rational trigonometric sums.