In this paper, some special group divisible designs have been constructed from ovals in finite projectiveplanes.
本文利用有限射影平面中的卵形,构造了一些特殊的可分组设计。
2
This paper discusses the solutions of the equations of a class of projective cylinders formed by space curves onto general planes.
文章主要讨论了空间曲线在一般平面上的射影柱面方程的求法。
3
Sphenoid projection, a projection has more projective centers which are the crossing points intersected by minor axis of the ellipsoid and the parallel planes.