1- Shahid Chamran University of Ahvaz , Hedayatian@scu.ac.ir
 2- Shahid Chamran University of Ahvaz 
                    
                    
                    Abstract:       (1481 Views)
                    
                    
                    In this paper, by using the concept of Cartan curvature,  the  Douglas metric reduce to  constant R.I   Landsberg metric  and if it's bounded, to  Riemannian one. Finally, it is shown that with a condition on Cartan curvature, Landsberg, weakly Landsberg and generalized Landsberg  metrics are equivalent.
                    
                    
                    
                    
                    
                    Type of Study:  
S |
                    Subject: 
                    
Differential Geometry  Received: 2022/01/27 | Revised: 2024/04/7 | Accepted: 2022/12/5 | Published: 2023/12/31 | ePublished: 2023/12/31