张量是一个定义在一些向量空间和一些对偶空间的笛卡儿积上的多线性函数，其坐标在    维空间内，有  个分量的一种量， 其中每个分量都是坐标的函数， 而在坐标变换时，这些分量也依照某些规则作线性变换。 称为该张量的秩或阶（与矩阵的秩和阶均无关系）。-Is a definition of a Cartesian tensor in some vector space and some dual space product multi linear function of the coordinates in the dimensional space, there is a quantity of components, where each component is function of coordinates, and the coordinate transformation, these components are in accordance with certain rules for linear transform. The rank order of the tensor is not related to the rank order of the matrix.