This paper proves that Pappus proposition by means of analytical solution at real projective coordinate system and the issue about six point collineation are derived according to perspective feature of projective correspondence. Finally, the result of this thesis can be further generalized.
借助射影坐标系用解析方法证明了巴卜斯命题，并由巴卜斯命题按照射影对应的透视特征导出了六点共线问题，最后把这个结果作了进一步的推广。
Based on the relationship between two views indicated as 2-D projective collineation, prediction problems about points or lines from two views or three views can be solved effectively.
基于2-D射影对应所描述的视图关系，可以有效解决双视图和三视图条件下的点元素或线元素的预报问题。
The main result: Let q be a power of a prime, and if G is a collineation group of a projective plane and G acts transitively on the points, then G is not isomorphic to PSU (3, q~2).
得到主要结果：令q是素数方幂，若G是一个射影平面的共线变换群并且传递地作用在点集合上，则G不能与PSU（3，q2）同构。