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Fractional cartesian products of sets

Ron C. Blei (1979)

Annales de l'institut Fourier

Let E be a subset of a discrete abelian group whose compact dual is G . E is exactly p -Sidon (respectively, exactly non- p -Sidon) when ( * ) C E ( G ) r holds if and only if r [ p , ] (respectively, r ( p , ) ). E is said to be exactly Λ β (respectively, exactly non- Λ β ) if E has the property ( * * ) every f L E 2 ( G ) satisfies G exp ( λ | f | 2 / α < , for all λ > 0 , if and only if α [ β , ) (respectively, α ( β , ) ).In this paper, for every p [ 1 , 2 ) and β [ 1 , ) , we display sets which are exactly p -Sidon, exactly non- p -Sidon, exactly Λ β and exactly non- Λ β .

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