转轴变换下的不变量的简易证明

A Simple Proof of invariant Under the Fransformation of Spin Axis

给出了二次曲面在转轴变换下的六个不变量的简易证明．类似地，可给出二次曲线在转轴变换下的四个不变量的简易证明．

A simple proof of six invariants under the transformation of spin axis is put forward.So is the four invariants of the qudratic curve under the transformation of spin axis.