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Le but de cette notes est rectification et addition à la note "Sur l'unicité du développement trigonométrique" publiée dans Fundamenta Mathematica, vol. III, p.287.
Le but de cette note est de démontrer le suivant théorème: Si la série trigonométrique a_0/2 + ∑_{n=1}^{n = ∞}(a_n cos2πnx + b_n sin2πnx ), dont les coefficients a_n, b_n tendent vers zéro quand n → ∞, converge vers zéro partout, sauf peut-être aux points d'un ensemble fermé Z, ou, plus généralement, si partout, sauf peut-être aux points de Z, on a a_0/2 + lim_{r → 1} ∑_{n=1}^{n = ∞}(a_n cos2πnx +...
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