用Tchebycheff-Fourier级数的Fejér和逼近函数类Lipα的误差

ON THE ERROR OF APPROXIMATION OF lipαFUNCTION CLASS BY FEJER'S SUM OF TCHEBYCHEFF-FOURIER SERIES

考虑用Ｔｃｈｅｂｙｃｈｅｆｆ－Ｆｏｕｒｉｅｒ级数的Ｆｅｊｅｒ和逼近ｆ（ｘ）∈Ｃ［－１，１］，在ｆ（ｘ）∈Ｌｉｐａ时得到了误差的表达式．

The approximation of f∈C[-1,1] by Fejér's sum of Tchebycheff-Fourier series is considered. The expressions for approximation error are obtained when f∈Lipα.