Geodesic
Change of variable and the rapidity of decrease of Fourier coefficients
Sbornik. Mathematics, Tome 70 (1991) no. 2, pp. 541-555 
V. V. Lebedev. Change of variable and the rapidity of decrease of Fourier coefficients. Sbornik. Mathematics, Tome 70 (1991) no. 2, pp. 541-555. http://geodesic.mathdoc.fr/item/SM_1991_70_2_a11/
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     title = {Change of variable and the rapidity of decrease of {Fourier} coefficients},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We consider the class $C(T)$ of continuous real-valued functions on the circle. We investigate the possibility of carrying, by a simultaneous change of variable, families of functions in $C(T)$ to classes of functions selected in a natural way for the rapidity of decrease of their Fourier coefficients.

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