4·î12Æü(ÌÚ)  15:30 -- 17:00  Vilmos Komornik 
                             (Universite Louis Pasteur, France)
             ``On some theorems of Ingham and Kahane''

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n 1936, Ingham improved a previous result  of Wiener  on nonharmonic
Fourier series. Modifying his weight function we obtain optimal results
improving several earlier  theorems of  Kahane, Ullrich, Zuazua et al.
We illustrate the usefulness of these results in control theory.