Since scalars are independent of the coordinate system, the dot product of two vectors is called a scalar invariant. 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。
The invariant eigen-operator method is successfully applied to solving energy levels for some quantum systems Hamiltonian. 摘要目前不变量本征算符方法已成功地解决了某些量子系统哈密顿量能级问题。
