偶数维Damek-Ricci空间的曲率

Curvature of Even-Dimensional Damer-Ricci Spaces

选取最低偶数维的非Riemann对称的Damek Ricci空间,即秩为5的部分八元数Heisenberg群的一维可解扩张,构造出一种14维Damek Ricci空间,它的截面曲率的上界可以达到0.

Choosing the lowest even-dimensional non-symmentric Damek-Ricci spaces. That is to say: using the solvable extemtion of rank 5 from part Octonional Henserberg group to construct 14-Demmensional non-symmetric Damek-Ricci space, its sectional curvature can get to zero.