arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.4429math.COcs.CG
收藏

广义平衡线数

The number of generalized balanced lines

David Orden, Pedro Ramos, Gelasio Salazar

摘要:

令$S$是平面中一般位置的$r$红点和$b=r+2d$蓝点的集合,其中具有$d\geq 0$。由它们确定的线$\ell$被称为平衡的,如果在由$\ell$界定的每个开放半平面中,红点和蓝点的数量之差是$d$。我们证明了每个如上所述的集合$S$至少有$r$平衡线。证明中的主要技术是旋转和推广,滑动旋转,这里介绍。

英文摘要:

Let $S$ be a set of $r$ red points and $b=r+2d$ blue points in general position in the plane, with $d\geq 0$. A line $\ell$ determined by them is said to be balanced if in each open half-plane bounded by $\ell$ the difference between the number of red points and blue points is $d$. We show that every set $S$ as above has at least $r$ balanced lines. The main techniques in the proof are rotations and a generalization, sliding rotations, introduced here.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑