本书暂定概念：尚未进入正式概念库。下面是本书给出的定义原文。
定义 · 3.2 联络与曲率
然而，还有另一种求导的方式，它最终会被证明更为有用。这里的导数同样与一个向量场 X 相联系。不过这一次，我们引入一个不同的对象，称为联络(connection)，用它把一点处的向量空间映射到另一点处的向量空间。这样得到的是一个与李导数不同的对象，称为协变导数(covariant derivative)。
英文原文
There is, however, a different way to take derivatives, one which ultimately will prove more useful. The derivative is again associated to a vector field X. However, this time we introduce a different object, known as a connection to map the vector spaces at one point to the vector spaces at another. The result is an object, distinct from the Lie derivative, called the covariant derivative.
出处：3.2 联络与曲率 · node a-fdefdaa689ca9327c8dc13d7 · 源节点 SHA-256 154c60e7c6c2f6d7…