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These are questions asked by faeze

 I am trying  to solve a system of equations which involeves differentiation or partial differentiation of unknown functions that I want theis strick expressions. but maple gives me this error

Error, (in solve) cannot solve expressions with diff(alpha(r, t), r) for alpha(r, t)

Is there any way for solving such equations?


I have metric tensor, how can i calculate covariant derivative of an arbitrary  contravariant tensor of rank 2?


I have an unkhown function as f(r) which i want to solve it at the end of calculation. How can i define it in beggining?

How can i import data from another worksheet (ecept copy and paste method)?

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