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JOURNALS // Matematicheskie Zametki // Archive

Mat. Zametki, 2006 Volume 80, Issue 1, Pages 50–59 (Mi mzm2779)

This article is cited in 12 papers

Everywhere Divergent $\Phi$-Means of Fourier Series

G. A. Karagulian

Institute of Mathematics, National Academy of Sciences of Armenia

Abstract: For a function $f\in L^1({\mathbb T})$, we investigate the sequence $(C,1)$ of mean values $\Phi(|S_k(x,f)-f(x)|)$, where $\Phi (t)\colon [0,+\infty)\to [0,+\nobreak \infty)$, $\Phi (0)=\nobreak 0$, is a continuous increasing function. We prove that if $\Phi $ increases faster than exponentially, then these means can diverge everywhere. Divergence almost everywhere of such means was established earlier.

Keywords: Fourier series, means of Fourier series, the space $L^1({\mathbf T})$.

UDC: 517

Received: 28.04.2005
Revised: 07.10.2005

DOI: 10.4213/mzm2779


 English version:
Mathematical Notes, 2006, 80:1, 47–56

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