Inequalities for exponential sums are studied. Our results improve an old result of G. Halasz and a recent result of G. Kos. We prove several other essentially sharp related results in this paper.
Inequalities for a number of different types of convexity
Inequalities for 1/(1-cos(x)) and its derivatives
Exponential sums with coefficients 0 or 1 and concentrated L^{p} norms
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