A systematic application of
simple functional analytic techniques (boundedness principles and the Hahn-Banach
theorem) is made to establish a few results in harmonic analysis.
For the circle group, results are obtained about the possible misbehaviour of
conjugate functions and related multiplier transforms.
For infinite compact Abelian groups, results are obtained about the possible
misbehaviour of functions or pseudomeasures f for which the Fourier transform
f is o(ρ), where ρ is a preassigned nonnegative function on the character
group.
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