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Cette note concerne une question traitée par monsieur Banach dans sa note "Sur une classe de fonctions continues" (Fundamenta Mathematcae, volume VIII, page 166). Dans cette note monsieur Banach démontre qu'un fonction continue satisfaisant aux conditions qu'il appelle (N) et (T_1), ou, ce qui revient au même, à la condition (S), a une dérivée dans un ensemble de mesure positive. L'auteur...
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