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Soit une suite orthonormale dans l’intervalle . L’auteur démontre, que pour tout et presque partout dans . La démonstration est basée sur un théorème de MM. Gál et Koksma et on peut généraliser aussi pour le cas (théorème auxiliaire). En utilisant ce théorème auxiliaire on obtient tout de suite l’estimation connue pour les fonctions de Lebesgue (théorème 2) [voir Kaczmarcz et Steinhaus, Theorie der Orthogonalreihen, Warszawa, 1935, 577].
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