英和和英

名詞

projective plane (複数形 projective planes)

1. (geometry) A plane in which any pair of distinct points determine a line and any pair of distinct lines intersect at a point.
   • 2004, David S. Dummit; Richard M. Foote, chapter 6, in Abstract Algebra‎^[1], →ISBN, page 210:

     Generally, a projective plane of "order" N has ${\displaystyle N^{2}+N+1}$ points, and the same number of lines.