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2017-03-03 14:39:05 +0100 | commented answer | Covariant Derivative gives Error, why? (SAGE 7.5.1) Great, I did, it works. |

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2017-03-02 11:18:17 +0100 | commented answer | Covariant Derivative gives Error, why? (SAGE 7.5.1) Thanks Eric, now that I know it is a bug, i will for now use an older version of Sage. Many greetings! |

2017-03-02 00:08:09 +0100 | asked a question | Covariant Derivative gives Error, why? (SAGE 7.5.1) This simple code gives an Error: This Error doesn't occur either if I avoid the square root in S[1,1]=R^(0.5), for example by writing S[1,1]=R^(0.4) or if I avoid the dependence of the derivative of f in the first entry of the metric, for example by writing G[1,1]=f(R)^2. This Error also doesn't occur in older Sage versions, for example Sage 7.1 Thanks a lot for help! |

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