【摘要】 讨论Kropina度量的射影性质及曲率性质,得到:Kropina度量成为Douglas度量当且仅当β是闭的1形式.计算Kropina度量的S曲率并得到其具有几乎迷向S曲率及常S曲率的条件.更多还原

【Abstract】 In this article, we discuss the projective properties and curvatures of kropina metric. We get the Kropina metric F is Douglas metric if and only if β is closed. Meanwhile, we get some of its other projective properties; We calculate its S-curvature and obtain the condition for F to be of almost isotropic S-curvature and constant S-curvature.更多还原