C. Pfannschmidt, A GENERALIZATION OF THE THEOREM OF HARDY - A MOST GENERAL VERSION OF THE UNCERTAINTY PRINCIPLE FOR FOURIER INTEGRALS, Mathematische Nachrichten, 182, 1996, pp. 317-327
N. WIENER, remarked that a non-identically vanishing real function and
its Fourier transform cannot both decay ''very fast''. It was HARDY w
ho specified and proved this assertion in 1933. In the present paper H
ardy's theorem will be generalized. Moreover, it will be shown that fu
rther weakening of these assumptions does not make sense.