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。
The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.
本文讨论了对称张量场共形协变方程的真空解。
Vacuum solutions of conformally covariant equation for symmetric tensor field are discussed.
这种分解可以给出高阶张量协变导数的另一种定义。
This decomposition may give another definition of high order tensor's covariant derivative.
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