论平面场上的对偶问题

Research on Dual Problem of Plane Field

首次以齐次射影坐标研究平面场上的对偶问题，揭示出对偶问题的本质：在平面场上，同一齐次射影坐标既可表示点、也可表示直线；并且所表示的点与直线之间有对偶关系。

Using homogeneous prouective coordinate ,this paper researches dual of plane field and reveals the essence of plane field-the same coordinate represents both point and line ,and there is dual relation in the point and the line.