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These are replies submitted by trace

Thank you


Works perfectly but i have some problem with a system of equations , i dont know what is wrong with

@vv Thank you but the right diagram by analytical approach is very different. What's the point? 

@John Fredsted 

Thank you for your attention.

I have uptodated my

@John Fredsted

I used your method for maxwell equation what do think about that?

I think i made mistake !



There is a generic problem in both of them( and  i mean when you put H^2=H^3=..=0 (or g^2=..=0) you expect to have smaller result but with your method you will have very long resul. 


Dear Edgardo in i want to eliminate H(r)^2 ,H(r)^3,... but with frontend(series ,[ ]) i cant do it , please show me

@John Fredsted 

Thank you John. its perfect.

How to use your method for Maxwell equation ?

@John Fredsted 


its a good way but  derivatives of g(r) and h(r) are presented in expr

@ecterrab @ecterrab 

Thank you for your reply.

i used frontend(series, [(17), g(r), 2]) but did not work.


Yes i mean assigning values to the components of k , but i can not do it , even i can not do k_[]


Thank you for your points.

I have some questions , How can i put k components in 17 and how can i eliminate non-linear terms like g(r)^2 from 17 and how can we do this process for maxwell equation ?



for simplisity i consider phi(x)



thank you.

This is the solution i was chasing.

Dear @ecterrab 

I think components of the extrinsic curvature are not equal to zero



@John Fredsted yes I want to know what transform functions can provide this explicit forms. can maple find these transform functions? 



first of all thanks for your attention ,

what we are looking for is finding the transform function between coordinate systems. in our case , we have a metric with coordinates (M,J) and have another metric with coordinates ( t,x) but don't know M(x,t) and J(x,t) .


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