在电磁学范围内研究D=ε_oE_o的充要条件

The Ample and Essential Condition with Regard to the Displacament VectorD=ε_o,E_o

在电磁学范围内研究电位移矢量D与极化电荷无关的充要条件．

It discusses the problem that the ample and essential condition ensures thedisplace ment vector having nothing to do with the diel ectric presented in the electric fieldin the limits of the electro magnetism.