英语语法分析

The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.

协变和逆变的区别对于张量的计算尤为重要，这往往会出现混合方差。

Tensors Under Rotations. Multipole Expansion.

转动下之张量。多极展开。

Quantities like stresses are called tensors of rank 2.

类似于压力的量称为2阶的张量。