I defined two tensors (vectors) U and D and their components in Maple 2025 using the Physics package. I enter U[~alpha]*U[alpha] and get a symbolic result. SumOverRepeatedIndices expands this but does not substitutes the expressions of the components I gave. How to force Maple to use the values of the components?

Thank you!

I define coordinates, a metric, and a tensor. Works good.

I calculate a covariant derivative, and I get an answer in terms of an unevaluated sum of Christoffel symbols. Calculating a Christoffel symbol works well. How to evaluate the result of the covariant derivative?

Thanks in advance.

Can someone tell me how to calculate the Christoffel symbols in spherical coordinates in Euclidean three dimensional space?

Thank you very much in advance!

Perhaps a stupid question but I fail to convert 2^1/4a^1/4/pi^1/4 (a result of a calculation performed by maple) into (2a/pi)^1/4.

I tried simplify, combine, collect, ... with options. None of them work.

Thank you. 

 can be simplified :l *h*t/m

How can I ask Maple to do this.