Rearrangements of Trigonometric Series and Trigonometric Polynomials

Details Rearrangements of Trigonometric Series and Trigonometric Polynomials Rearrangements of Trigonometric Series and Trigonometric Polynomials

2003-03-05

arxiv.org/abs/math/0303064v1

Mathematics

Classical Analysis and ODEs

Scientific paper

The paper is related to the following question of P.~L.~Ul'yanov: is it true that for any $2\pi$-periodic continuous function $f$ there is a uniformly convergent rearrangement of its trigonometric Fourier series? In particular, we give an affirmative answer if the absolute values of Fourier coefficients of $f$ decrease. Also, we study a problem how to choose $m$ terms of a trigonometric polynomial of degree $n$ to make the uniform norm of their sum as small as possible.

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