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On the vector-valued Fourier transform and compatibility of operators

In Sook Park — 2005

Studia Mathematica

Let be a locally compact abelian group and let 1 < p ≤ 2. ’ is the dual group of , and p’ the conjugate exponent of p. An operator T between Banach spaces X and Y is said to be compatible with the Fourier transform F if F T : L p ( ) X L p ' ( ' ) Y admits a continuous extension [ F , T ] : [ L p ( ) , X ] [ L p ' ( ' ) , Y ] . Let T p denote the collection of such T’s. We show that T p × = T p × = T p × for any and positive integer n. Moreover, if the factor group of by its identity component is a direct sum of a torsion-free group and a finite group with discrete topology then T p = T p .

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