We prove that if the system of integer translates of a square integrable function is l^2-linear independent then its periodization function is strictly positivealmost everywhere. Indeed we show that the above inference holds for any square integrable function since the following statement on Fourier analysis is true: For any (Lebesgue) measurable subset A of [0, 1], with positive measure, there exists a non trivial square summable function, with support in A, whose partial sums of Fourier series are uniformly bounded in the uniform norm. This answers a question posed by Guido Weiss.
l^2-Linear Independence for the System of IntegerTranslates of a Square Integrable Function
SALIANI, Sandra
2013-01-01
Abstract
We prove that if the system of integer translates of a square integrable function is l^2-linear independent then its periodization function is strictly positivealmost everywhere. Indeed we show that the above inference holds for any square integrable function since the following statement on Fourier analysis is true: For any (Lebesgue) measurable subset A of [0, 1], with positive measure, there exists a non trivial square summable function, with support in A, whose partial sums of Fourier series are uniformly bounded in the uniform norm. This answers a question posed by Guido Weiss.File in questo prodotto:
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