【摘要】 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。实践证明：当两线束中心之一为非固有点时，所得曲线为双曲线，抛物线或退化的二次曲线；当两线束中心均为非固有点时，所得曲线是双曲线或退化的二次曲线。更多还原

【Abstract】 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.It is found that the tormed curves are conics.parabolas or interlacing straight lines when ne of the two centers is improper point and the tormed curves are conics or degenerate conics when the both centers are improper points.更多还原