从二次曲线的化简看一类坐标变换

On Coordinate Transformation from the Reduction of the Curve of Second Order

通过对二次曲线化简的讨论,可知平移、转轴实际上属于同一类坐标变换,此类变换保持矢量的模,两矢量的夹角以及角的转向.

：This paper discusses the reduction of the curve of second order and draws the conclusion that translation and rotation of the axes belong to the same kind of coordinate transformation. This kind of transformation keeps modulus of vector,, angle of intersection between two vectors and angle of rotation.