By using the role and the drafting methods, projective contour line of a quadric at random position can be drawn.
利用这一规律和作图方法，可以解决任意位置的非退变二阶曲面的投影轮廓线的作图问题。
In this paper, a proper analytic methods is proposed for determining the projective formulas when their centers are improper points between two line pencils of projective correspondence.
在两线束射影对应中，当两线束中心为非固有点时，两线束的射影关系式如何确定？本文给出了适当的解析方法。
This note shows that when studying geometric properties, a polynomial system is defined as a line field on a projective space such that its singular set has co dimension at least 2.
证明：在研究多项式系统的几何性质时，多项式系统应当定义成射影空间中奇点集之余维数至少为2的线场。
Two different surface straight lines distance not essential discovers male hangs the line segment, only must solve using the vector projective property then.
两条异面直线的距离也不必要找出公垂线段，只需利用向量的射影性质来解即可。
Two different surface straight lines distance not essential discovers male hangs the line segment, only must solve using the vector projective property then.
两条异面直线的距离也不必要找出公垂线段，只需利用向量的射影性质来解即可。
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