Abstract
An upper bound for the multiplicative energy of the spectrum of an arbitrary subset of \(\mathbb{F}_{p}\) is obtained. Apparently, at present, this is the best bound.
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Shkredov, I.D. A Short Remark on the Multiplicative Energy of the Spectrum. Math Notes 105, 449–457 (2019). https://doi.org/10.1134/S0001434619030155
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DOI: https://doi.org/10.1134/S0001434619030155