Weyl sums, mean value estimates, and Waring's problem with friable numbers

Abstract : In this paper we study Weyl sums over friable integers (more precisely $y$-friable integers up to $x$ when $y = (\log x)^C$ for a large constant $C$). In particular, we obtain an asymptotic formula for such Weyl sums in major arcs, nontrivial upper bounds for them in minor arcs, and moreover a mean value estimate for friable Weyl sums with exponent essentially the same as in the classical case. As an application, we study Waring's problem with friable numbers, with the number of summands essentially the same as in the classical case.
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Sary Drappeau, Xuancheng Shao. Weyl sums, mean value estimates, and Waring's problem with friable numbers. Acta Arithmetica, Instytut Matematyczny PAN, 2016, 176, pp.249-299. ⟨10.4064/aa8448-7-2016⟩. ⟨hal-01298060⟩

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