协变导数
- 网络covariant derivative
协变导数-
规范场论中引进协变导数的物理实质
Physical Essence of Introducing Covariant Derivative into Gauge Theory
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这种模型的一个优点是虽然将壳体仍然看作二维结构，但是它没有复杂的微分几何概念，如没有协变导数、Riemannian-Christoffel记号等。
This formulation of the shell equations has the advantage that , although the exact nonlinear geometric structures of the idealized two-dimensional body are maintained , the complex differential geometry concepts such as covariant derivatives , Riemannian connections or Christoffel symbols are avoided .