射影直线;投影线
The congruent point range and line pencils between two projective planes
两射影平面场的合同点列与线束
Two Coincident Points of the Two Common Line Projective Series Points
二共底射影点列的二重点
Give the definition by purely synthesis projection of harmonically conjugate point ( line) pair, and prove equivalence of projective definition with algebra definition.
给出调和共轭点(线)偶纯综合射影定义,并证明射影定义与代数定义的等价性。
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