摘要
以2l为周期的函数f(x)也可看作周期为4l.设f(x)满足 Dirichlet充分条件,按[1]方法展开的以 2l为周期的 Fourier 级数和以 4l为周期的 Fourier 级数则对应于不同表达式.
The periodic function of period 2 l is still the periodic function of period 4 l. Their Fourier serieses are differ in form. In this paper, we prove that the two expressiones are one and the same.
出处
《工科数学》
1999年第3期153-155,共3页
Journal of Mathematics For Technology