We consider a Fokker-Planck operator with electric potential and electromagnetic fields.We establish the sharp weighted ......

本文研究了光滑流形上微分形式的亚椭圆性，利用遍历平均的方法，得到了二维环面上变系数1-形式是亚椭圆的充要条件．......

讨论了一类典型的主同维重特征算子的亚椭圆性，并利用不变变换群得到了此类方程的解。...

In this paper,we use the method of representation of Lie group to study a class of nonhomoge-neous convolution operator ......