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These are questions asked by Llew

I have just started using Maple 17 for general relativity, and I have managed to set up coordinates and enter a somewhat complicated spacetime metric, and to find the Killing vectors for the metric.

I can't seem to do something much more basic, though, initialize the components of a vector field as functions of the coordinates.

For example, how would I set up a 4-vector field A such that the contravariant component A^3 = cosh(x2), where x2 is one of my coordinates?


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