This paper deals with the graphics of the intersections and common tangents of two conics according to projective geometry .
在射影几何的范畴内，全面地论述了两二次曲线的公有点和公切线的图解问题。
Desargues who was a French mathematician in 17th century had made creative achievement in the aspect of projective geometry.
17世纪法国数学家笛沙格在射影几何方面的工作具有创造性成就。
Cross ratio and element at infinity are two important concepts with projective geometry and primary tools in considerate projective property of figures.
交比和无穷远元素是射影几何中的两个重要概念，它们是探讨图形射影性质的主要工具。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
These results will take an important part in studying fractional ring (module), localization method and projective geometry.
这些结果无疑对更进一步研究分式环(模)及局部化方法，特别是投射几何代数的研究大有裨益。
Method: First, device parameters and azimuth parameters of analytic geometry model and projective geometry model of coded structured light system were analyzed and unified.
方法：首先，比较分析编码结构光系统的解析几何模型和射影几何模型，统一了二者的设备参数、姿态和位置参数。
The concept of weak block design is proposed in this paper. Based on affine geometry and projective geometry, affine manifold codes and projective manifold codes are constructed.
提出了弱区组设计的概念，并根据仿射几何和射影几何构造了仿射流形码和射影流形码。
The concept of weak block design is proposed in this paper. Based on affine geometry and projective geometry, affine manifold codes and projective manifold codes are constructed.
提出了弱区组设计的概念，并根据仿射几何和射影几何构造了仿射流形码和射影流形码。
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