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Un théorème d’extrapolation et ses consequences. (French) Zbl 0258.46031

##### MSC:
 46E30 Spaces of measurable functions ($$L^p$$-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.) 28A10 Real- or complex-valued set functions 60B99 Probability theory on algebraic and topological structures