第二类Chebyshev-Fourier级数部分和逼近有界变差函数

Approximation of Bounded Variation Function by the Partial Sum of the Second Chebyshev-Fourier Series

得到了第二类Chebyshev-Fourier级数部分和对[-1,1]上有界变差函数点态逼近估计的一个定理,并把这个定理应用于单调型连续函数.

A theorem on estimate of pointwise approximation of bounded variation functions defined on [ - 1,1 ] by the partial sums of the second Chebyshev-Fourier series is obtained, and this theorem to monotonic type continuous functions is applied.