Therefore, the parameter of two space Desargues configuration is added.
将两空间笛沙格构图成透射的参数补齐。
Based on the Second Desargues Theory and involution theory, a simple drawing method for a conic is presented.
为了使二次曲线的作图更简便，文章以第二笛沙格定理和对合定理为基础，提出了一种新的作图方法。
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。
With some examples in plane geometry, the author indroduces how to use Desargues theorem to simplify the proofs of problems of collinear points and concurrent lines.
利用代沙格定理及其逆定理 ，对平面几何的几个共线点和共点线的问题给出简捷的证法。
With some examples in plane geometry, the author indroduces how to use Desargues theorem to simplify the proofs of problems of collinear points and concurrent lines.
利用代沙格定理及其逆定理 ，对平面几何的几个共线点和共点线的问题给出简捷的证法。
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