交比的一些新几何特性

Some New Geometric Characteristics of Cross-ratio

交比是一个重要的几何不变量。本文给出了交比的一个新的几何性质,并讨论了M觟bius变换的迹与交比之间的关系。

Cross-ratio is one of the important geometric invariants. This paper gives a new geometric property of the cross-ratio and discusses the relation between the trace of the Mobius transformation and the cross-ratio.