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Universidade Federal do Espírito Santo

MaplePrimes Activity

These are replies submitted by deniscr


Thanks for your help!

I can't apply your suggestion to my problem. The matrices M and C are the following


By the way, I know the matrix U

The point is: I need to reproduce this case to apply in another case.


Thanks for your answer!

Unfortunately, the matrix U is a unknown matrix. It isn't numeric matrix.


Thanks for your answer!

I use Maple 2017 and still happening,

It changes when I do the command g_[line_element] in package Physics. Later this change causes some problem in the rest calculations.


You are amazing! Thanks! I will test!



First of all, thanks for your reply.

I'd like to say that I know the Physics package and I think it's fantastic. I have done a great deal in him, especially in General Relativity. I have also followed the launch of Maple 2017 and its news!

I can say that I know the commands that you have indicated.

Initially, I tried to use the Physics package, but in it I can not reproduce a certain result.

Starting from this metric

I need to get this



With this definition

Unfortunately, the Physics package does not reproduce these results in the same way. So I had to resort to the grtensor, but I can not define all the components of the tensor.


Thanks a lot for your attention!

Ok, I need replace the E value. I don't find any instruction about like to do and I don't know if it is possible.
I would like to replace E, for example,

E = (I*a*sin(theta))/(sqrt(2)*(R+I*a*cos(theta))),

that means to introduce rotation in a static metric.

Thank you for the tips,


@John Fredsted 

Thanks for your attention!

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