$\ell^2$-Linear Independence for the System of Integer Translates of a Square Integrable Function

Details $\ell^2$-Linear Independence for the System of Integer Translates of a Square Integrable Function $\ell^2$-Linear Independence for the System of Integer Translates of a Square Integrable Function

2010-11-09

arxiv.org/abs/1011.2129v1

Mathematics

Classical Analysis and ODEs

Scientific paper

We prove that if the system of integer translates of a square integrable function is $\ell^2$-linear independent then its periodization function is strictly positive almost everywhere. Indeed we show that the above inference is true for any square integrable function if and only if 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.

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