I have a nondegenerate (0,2)-tensor omega on a manifold which is not a metric and I would like to compute its 'inverse', which is a (2,0)-tensor.
I tried omega[:].inverse() but I get the following error 'ChartFunctionRing_with_category' object has no attribute 'fraction_field'. This worked for me in older versions of Sagemath (I think it was 7.4).
