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Research Papers
Polynomial approximation in the mean on segments
N. A. Shirokov St. Petersburg Department of Steklov Mathematical Institute of Russian Academy of Sciences
Abstract:
Let $S_k$, $1\le k\le m$ – pairs of disjoint segments, $S_k = [a_k, b_k]$, $1<p_k<\infty$ functions $f_k$ are defined on $S_k$, $f_k$ belongs to $C(S_k)$ and $f'_k$ belongs to $L^{P_k}(S_k)$. The work proves that for $n=1,2,\dots$ there are polynomials $P_n$, $ \deg P_n \le n$ that approximate all functions $f_k$ in the metric $L^{P_k}$ with weights tending to infinity when approaching points $a_k$, $b_k$.
Keywords:
polynomials, approximation in the mean, $L^p$ spaces.
Received: 22.04.2024
Citation:
N. A. Shirokov, “Polynomial approximation in the mean on segments”, Algebra i Analiz, 36:5 (2024), 163–172
Linking options:
https://www.mathnet.ru/eng/aa1942 https://www.mathnet.ru/eng/aa/v36/i5/p163
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