I simply followed the "An Overview of General Relativity computations with DifferentialGeometry"
and typed the commands interactively.
->with(DifferentialGeometry); with(Tensor); with(Tools);
->DGsetup([t, r, theta, phi], M1, verbose);
The following coordinates have been protected:
[t, r, theta, phi]
The following vector fields have been defined and protected:
Error, (in Typeset:-Tdisplay[true]) `alias` does not evaluate to a module
Since I am learning GR now, I 'd like to use maple to help me to calculate (varify my own calculation) the various tensors, like killing. Later, to solve the classical GR problems.