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

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

ny2292000 10
September 20 2019
1

@Torre 

with(DifferentialGeometry);
with(Tensor);
with(LieAlgebras);
DGsetup([x, y], M);
g1 := evalDG(dx &t dx);
Christoffel(g1);
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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