polar triangle

A simple proof of finiteness of areas of asymptotic triangles in non-Euclidean geometry;

非欧几何中极限三角形面积有限性的简单证明

When it approaches the triangular limit,the non-diagonal reflection matrix of triangular statistical model is obtained.

本文得到了ＺｎＢｅｌａｖｉｎ模型反射矩阵的矩阵元表达式，在退化到三角极限后，得到了非对角的三角统计模型的反射矩阵。