摘要
作者为一张圆形的图的射影的飞机十字路口数字给上面的界限。另外，作者证明圆形的图 C (8,3 ) 和 C (9,3 ) 的射影的飞机十字路口数字分别地是 2 和 1。
The authors give an upper bound for the projective plane crossing number of a circular graph. Also, the authors prove the projective plane crossing numbers of circular graph C （8, 3） and C （9, 3） are 2 and 1, respectively.
基金
the National Natural Science Foundation of China under Grant No.10671073
Scientific Study Foundation of the Talented People Gathered by Nantong University
Science and Technology Commission of Shanghai Municipality under Grant No.07XD14011
Shanghai Leading Academic Discipline Project under Grant No.B407
Natural Science Foundation of Jiangsu's Universities under Grant No.07KJB110090
关键词
射影平面
图论
相交数
数学理论
Circular graph, crossing number, projective plane crossing number.
