射影直线上点的运算

THE CACULATING RULES OF POINTS IN A PROJECTIVE LINE

在一维射影变换中推证射影直线上点的运算规律，它满足数的运算法则．它的实现主要应用一维双曲射影变换群和一维抛物射影变换群以及透视变换的简单性质。

In this paper,we conclude the caculating rules of points in a projectiveline, which satisfy the caculating rules of real numbers under the 1-dimensional projectiveansformation. We prove this by using some properties of 1- dimensional hyperbolicprojective transformation group, parabolic projective transformation group and perspectiveansformation group,respectively.