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A note on rearrangements of Fourier coefficients

Hugh L. Montgomery — 1976

Annales de l'institut Fourier

Let f ( x ) Σ a n e 2 π i n x , f * ( x ) n = 0 a * n cos 2 π n x , where the a * n are the numbers | a n | rearranged so that a n * 0 . Then for any convex increasing ψ , ψ ( | f | 2 1 ψ ( 20 | f * | 2 1 . The special case ψ ( t ) = t q / 2 , q 2 , gives f q 5 f * q an equivalent of Littlewood.

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