因为标量与坐标系无关，故两个矢量的点积称为标量不变量。

Formulae on the base vectors and the coordinate variables derivative going with fluid particle and their application;

youdao

因为标量与坐标系无关，故两个矢量的点积称为标量不变量。

Formulae on the base vectors and the coordinate variables derivative going with fluid particle and their application;

youdao