Question: Tensor problem (all Christoffel symbols are zero) with Alcubierre metric



I am having problems with Maple. I am new to the software and I am looking to use it for tensors. I am working with the Alcubierre metric, for more details, click the images below.

These images should provide more clarity with the metric. My problem is that in Maple, I have successfully entered the metric, however whenever I use for example the Christoffel command, it states that all the Christoffel symbols are equal to zero.

I believe the reason why this is happening is because I have not defined the functions properly. I should be getting an answer like the example in the last picture below.

Would anyone be able to assist me in this? I would appreciate it greatly.


Many thanks.

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