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Date: 24-3-2019
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The entire function
(1) |
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(2) |
where is a polygamma function.
It satisfies and for all real . Amazingly, it also has the integral
(3) |
Furthermore, among all functions with the first two properties, minimizes the integral (3) (Beurling 1938, Montgomery 2001).
REFERENCES:
Beurling, A. "Sur les intégrales de Fourier absolument convergentes et leur application à fonctionelle." Neuvième congrès des mathématiciens scandinaves. Helsingfors, 1938.
Montgomery, H. L. "Harmonic Analysis as Found in Analytic Number Theory." In Twentieth Century Harmonic Analysis--A Celebration. Proceedings of the NATO Advanced Study Institute Held in Il Ciocco, July 2-15, 2000 (Ed. J. S. Byrnes). Dordrecht, Netherlands: Kluwer, pp. 271-293, 2001.
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