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S. B. Stechkin, “Approximation of continuous periodic functions by Favard sums,” Tr. Mat. Inst. Akad. Nauk SSSR,109, 26–34 (1971).
Translated from Matematicheskie Zametki, Vol. 43, No. 3, pp. 334–336, March, 1988.
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Runovskii, V.K. Real zeros of an even trigonometric polynomial. Mathematical Notes of the Academy of Sciences of the USSR 43, 192–193 (1988). https://doi.org/10.1007/BF01138840
- Trigonometric Polynomial
- Real Zero