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Sorry to bother the group but I don't know how to report a technical (but inconsequential) typo in Kerr_Schild.ipynb Where should I report it? After In[33] or so, "Check of the Identity"
\frac{x^2 + y^2}{r^2 + a^2} + \frac{z^2}{r^2} = 1
Should be:
\frac{x^2 + y^2}{R^2 + a^2} + \frac{z^2}{R^2} = 1
It seems to be too trivial for a 'Ticket' on the Sagemanifolds forum. I am just reading the program in detail; checking my understanding.