The Rectilinear Crossing Number Project

官方网站：http://dist.ist.tugraz.at/cape5/
主持机构：Graz University of Technology (Austria)
项目类别：数学

项目主旨：
What is the least number of crossings a straight-edge drawing of the complete graph on top of a set of n points in the plane obtains?  From very recent (not even published yet) mathematical considerations the rectilinear crossing numbers for n=19 and n=21 are also known. So the most tantalizing problem now is to determine the true value for n=18, which is the main focus of this project.

http://blog.sina.com.cn/u/49262375010006cq 跨越地平线 运气蛮好的，两次当选该项目的今日用户。

呵呵 好走运呀！
http://www.equn.com/forum/viewthread.php?tid=13371&fpage=6

没想到我也发重复帖了，唉，人老了，记性就差了。

俄，算这个项目十几秒一个WU，正常么？

正常
老的帖子里已经说明过了