Perturbing PLA

Details Perturbing PLA Perturbing PLA

2012-02-24

arxiv.org/abs/1202.5538v1

Mathematics

Classical Analysis and ODEs

21 pages

Scientific paper

We proved earlier that every measurable function on the circle, after a uniformly small perturbation, can be written as a power series (i.e. a series of exponentials with positive frequencies), which converges almost everywhere. Here we show that this result is basically sharp: the perturbation cannot be made smooth or even H\"older. We discuss also a similar problem for perturbations with lacunary spectrum.

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