Geodesic
On classes of infinitely differentiable functions
Sbornik. Mathematics, Tome 70 (1991) no. 1, pp. 11-30 Cet article a éte moissonné depuis la source Math-Net.Ru

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Sharp estimates are established for the relationships among the rate of growth of the derivatives of an infinitely-differentiable periodic function, the behavior of its Fourier coefficients, and the trigonometric polynomials of best approximation to it. 
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P. L. Ul'yanov. On classes of infinitely differentiable functions. Sbornik. Mathematics, Tome 70 (1991) no. 1, pp. 11-30. http://geodesic.mathdoc.fr/item/SM_1991_70_1_a1/

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