<span>Some Examples of Metrics with Positive Curvature and Negative Curvature on R</span><sup>n</sup>

朱大新, 侯文华, 宋清芳

Some Examples of Metrics with Positive Curvature and Negative Curvature on Rⁿ

Zhu Daxin, Hou Wenhua, Song Qingfang

数学季刊 . 1995, (2): 29 -32 .