Hi Samuel, Le mercredi 4 janvier 2017 20:49:54 UTC+1, Samuel Lelievre a écrit : > > > > It's of course a good thing to track the issue, but on the other side, > why work in the Symbolic Ring? > > It's because I need to consider sqrt(-z), so that I cannot stay with rational functions. Actually sqrt(-z) is the volume element of the Tomimatsu-Sato 3-metric: http://nbviewer.jupyter.org/github/sagemanifolds/SageManifolds/blob/master/Worksheets/v1.0/SM_Tomimatsu-Sato_3p1.ipynb Note that, despite this issue with the volume element, Sage is doing pretty well with this complicated metric (see e.g. the huge expression of the Ricci scalar in Out[24]): all Einstein equations are passed.
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