Question: How is this problem solved if the &t does not work...


DGsetup([x, y], M);
g1 := evalDG(dx &t dx);
Error, (in DifferentialGeometry:-Tensor:-Christoffel) expected 1st argument to be a metric tensor. Received: _DG([["tensor", M, [["cov_bas", "cov_bas"], []]], [`...`]])


I still get an error.  I was able to succeed in another example (when I copied the whole maple example.

Somehow, I cannot get the correct syntax.

Any help would be welcome.  The only explanation is that somehow the definition of the neutral tensor operator is missing.

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