It is proved that the substitituon mapping is a proper Fourier integral operator with generalized hypoellipticity.

证明了变量替映射是一个具广义亚椭园性的适的富里积分算子。

By using the method of coordination transformation and expandedness Fourier series, an analytic solution is obtained from studying the Newtonian fluids laminar flow in eccentric anulus.

采用坐标变和函展开成傅立级的方法,推导出了牛顿流体偏心环空轴向流动速度场的严格解析解.

A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.

用比较直接的方法证明幂级的和函在收敛域内可以逐项微分的公式；并得到了计算傅立系的一种简便方法.