3维射影空间中笛沙格定理的推广

The Generalization of Desargus Theorem for 3-Dimension Projective Space

本文将笛沙格定理推广到３维射影空间，证明了空间两个四面体对应顶点的连线交于一点，则其对应侧面的交线共面．

The paper gives the generalization of Desargus theorem for 3-dimension projective space and proves that if the lines joining corresponding venices of two tetrahedra are concurrent in a point,then the corresponding faces,if extended, will intersect in three coplanar straight lines.