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arXiv 2202.01561math.CAmath.AP
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一般傅里叶级数收敛的几个问题

Some problems of convergence of general Fourier series

V. Tsagareishvili, G. Tutberidze

摘要:

S. Banach \cite{Banach}证明了函数良好的微分性质并不保证a.e.收敛的傅里叶级数的这个功能相对于一般的规范正交系(ONS)。另一方面,众所周知,a.e.的一个充分条件是:标准正交级数的收敛性由Menshov-Rademacher定理给出。本文讨论正数序列$(d_n)$,使得有界变差函数的傅里叶系数$(C_n(f))$与这些数相乘得到a.e.形式为$\sum_{n=1}^{\infty}d_n C_n(f) φ_n (x).$的收敛级数。

英文摘要:

S. Banach \cite{Banach} proved that good differential properties of function do not guarantee the a.e. convergence of the Fourier series of this function with respect to general orthonormal systems (ONS). On the other hand it is very well known that a sufficient condition for the a.e. convergence of an orthonormal series is given by the Menshov-Rademacher Theorem. The paper deals with sequence of positive numbers $(d_n)$ such that multiplying the Fourier coefficients $(C_n(f))$ of functions with bounded variation by these numbers one obtains a.e. convergent series of the form $\sum_{n=1}^{\infty}d_n C_n(f) φ_n (x).$ It is established that the resulting conditions are best possible.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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