有关对偶定理的证明方法讨论

摘要

At project image several what medium, from to accidentally thought to set out, study＂ three points totally always line＂ and＂three straight lines total[one] point＂ of to accidentally problem, from to accidentally the thought set out and study ＂three points totally always line＂ with the structure form of ＂three straight lines totalEone] point＂ and make virtuous Sa space triangle axioms and it to accidentally the axioms has a kind of relation of＂revolve＇ing and then give one this problem solve of＂regulation＂ method.%在射影几何中，从对偶思想出发，研究“三点共线”与“三线共点”的结构形式，使得德萨格三角形定理及其对偶定理具有一．中“旋转”关系，进而给出这类问题求解的“规律性”方法。