A short note on the multiplicative energy of the spectrum of a set
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🧮 math.NT
math.CO
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energymultiplicativespectrumarbitrarybestboundexponentialmathbb
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We obtain an upper bound for the multiplicative energy of the spectrum of an arbitrary set from $\mathbb{F}_p$, which is the best possible up to the results on exponential sums over subgroups.
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