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Displaying similar documents to “Forme abstraite du théorème de capacitabilité”

Opérations de Hausdorff itérées et réunions croissantes de compacts

Sylvain Kahane (1992)

Fundamenta Mathematicae

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In this paper, motivated by questions in Harmonic Analysis, we study the operation of (countable) increasing union, and show it is not idempotent: ω 1 iterations are needed in general to obtain the closure of a class under this operation. Increasing union is a particular Hausdorff operation, and we present the combinatorial tools which allow to study the power of various Hausdorff operations, and of their iterates. Besides countable increasing union, we study in detail a related Hausdorff...