Projective change is very important in highergeometry.
射影变换在高等几何中是十分重要的。
2
The discussion on the popularization of locus proposition leads to some results, which shows the connection between highergeometry and lower geometry.
讨论几何轨迹命题的推广，得列一些结论，从另一角度体现了高等几何与初等几何的联系。
3
Applying theories of numerical analysis and highergeometry, the corresponding mathematical model of stem line is established according to different stems.