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Le but de cette note est de donner une généralisation du théorème de Kuratowski (Casimir Kuratowski, Une remarque sur les classes de M. Fréchet, Fund. Math., p.41-43;), notamment de démontrer: Théorème: Toute infinité bien ordonnée d'ensembles croissants (décroissants) qui sont à la fois F_δ et F_σ est dénombrable.
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