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Complex Approximations, Orthogonal Polynomials and Applications Workshop
11 июня 2021 г. 11:00–11:25, г. Сочи
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Uniformly convergent Fourier series with universal power parts on closed subsets of measure zero
S. V. Khrushchev Satbayev University
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Аннотация:
Given a closed subset $E$ of Lebesgue measure zero on the unit circle $\mathbb{T}$ there is a function $f$ on $\mathbb{T}$ with uniformly convergent symmetric Fourier series
$$
S_n(f,\zeta)=\sum_{k=-n}^n\hat{f}(k)\zeta^k\underset{\mathbb{T}}{\rightrightarrows} f(\zeta),
$$
such that for every continuous function $g$ on $E$, there is a subsequence of partial power sums
$$
S^+_n(f,\zeta)=\sum_{k=0}^n\hat{f}(k)\zeta^k
$$
of $f$, which converges to $g$ uniformly on $E$. Here
$$
\hat{f}(k)=\int_{\mathbb{T}}\bar{\zeta}^kf(\zeta)\, dm(\zeta),
$$
and $m$ is the normalized Lebesgue measure on $\mathbb{T}$.
Язык доклада: английский
Website:
https://us02web.zoom.us/j/8618528524?pwd=MmxGeHRWZHZnS0NLQi9jTTFTTzFrQT09
* Zoom conference ID: 861 852 8524 , password: caopa |
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