conserved vector current

In this paper it is shown that there are two vector constants of the motion for a charged particle in the central field of force.

证明了带电粒子在有心力场中运动时有两个守恒矢量。

The conservative densities and conservative flows of theseconservation laws were also given.

证明了一类演化方程至少存在三个守恒律，并具体地给出了这三个守恒律的守恒密度及守恒流量，另外还给出了这些方程的高维、高阶及向量情形的某些推广。