黎曼流形上的弱协变微分与Sobolev空间
Weak covariant differentiation and Sobolev space on Riemannian manifolds
得到了欧氏空间中，单位球面上坐标函数关于某一特定标架场的协变微分的两个等式。
We obtain two formulas about the covariant derivative of the coordinate functions on the unit sphere in Eucdidean space .
协变微分协变微分协变微分