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Dérivabilité de certaines sommes de séries de Fourier lacunaires. (Derivability of certain sums of Lacunary Fourier series). (French) Zbl 0221.26008

MSC:
26A24 Differentiation (real functions of one variable): general theory, generalized derivatives, mean value theorems
42A55 Lacunary series of trigonometric and other functions; Riesz products
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