Generalization of an elementary inequality in Fourier analysis |
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Authors: | Guan-zhen Zhou |
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Institution: | Faculty of Statistics and Mathematics, Zhejiang Gongshang University, Hangzhou 310018, China |
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Abstract: | The inequality $
\mathop {\sup }\limits_{n \geqslant 1} \left| {\sum\limits_{k = 1}^n {\frac{{\sin kx}}
{k}} } \right| \leqslant 3\sqrt \pi ,
$
\mathop {\sup }\limits_{n \geqslant 1} \left| {\sum\limits_{k = 1}^n {\frac{{\sin kx}}
{k}} } \right| \leqslant 3\sqrt \pi ,
plays an important role in Fourier analysis and approximation theory. It has recently been generalized by Telyakovskii and
Leindler. This paper further generalizes and improves their results by introducing a new class of sequences called γ-piecewise bounded variation sequence (γ-PBVS). |
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Keywords: | PBV condition inequality |
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