|   | 1 |  initial version  | 
I've just run the Simon-Mars and Kerr spacetime notebook from the SageManifolds page with SageMath 9.0. Everything is fine. Which version of SageMath are you using?
|   | 2 |  No.2 Revision  | 
I've just run the Simon-Mars tensor and Kerr spacetime notebook from the SageManifolds page with SageMath 9.0. Everything is fine. Which version of SageMath are you using?
|   | 3 |  No.3 Revision  | 
I've just run the Simon-Mars tensor and Kerr spacetime notebook from the SageManifolds page with the latest stable version of SageMath 9.0. (9.0). Everything is fine. Which version of SageMath are you using?
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.