non-Desargues geometry 非德萨格几何
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。
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