Jacobe supta

9 years, 29 days

## original answer...

Thanks so much, very nice, it agrees with Mathematica answer!

But the original answer as I mentioned above is! i dont know how it is derived maybe with another form of change of variables ?

it is very similar to Mathematica and your answer ! but how it is derived

## revised integral...

I revised the integral which suffered from some problems. This new integral is only depends on "x". "n" is an even number. I would like to solve this integral in two regimes:

1) for a fixed "n" like "n=2" and as a function of "x" in a indefinite integral

2) as a function of "n" in a definite integral for "0<x<2pi".

Hope it could be solved.

Thank you all @acer @vv  @Axel Vogt

## epsilon...

@acer That was my fault not define "g" and "J". I editted the file and put it again here. Actually the integral should include only "Zeta". I think it is ready now, please check the Maple file, is it solvable?

Question.mw

## epsilon...

@acer But the problem remains unsolved because that was just a typo to pout the question here. Any idea to solve it?

## epsilon...

@acer Thank you for your point and your comment. Yes that was my mistake, in "W" we should have "ln(varepsilon)".

## I made a mistake...

@Rouben Rostamian  Thank you for your answer.

I made a mistake in writing the denominator!

corrected.mw

Thank you for your time

## Yes...

Absolutely right , i want to obtain  [ Omega, alpha, beta, k] in terms of the others.

## integral the functional...

I want to calculate the integral of " L"  for some solution of the equations of motion over some period of time. your solution just try to obtain equation of motion. the solution must be set into the Lagrangian and then you must integral over some period of time. The final result must have a shape like "A".

## what locf?...

@John Fredsted  I made a mistake. you can take the end of time "t=t_0" or other thing else you like. It is a constant and doesn't matter. I don't understand what do you mean about "locf". where I mentioned to this quantity?

## integral of functional...

@John Fredsted yes I used from this package and obtained the equation of motion but my problems is the next step: when I must use from these solution, put into "L" and integrate it from "t=0" to "t=L". I must obtain at last a solution like "A" regardless what is the constants "a, b, s, L"

PS: z(t)[h] is a constant as well and not be important

## Just extremising...

No I just want to solve the Euler-Lagrange equation for "L" and find equation of motions and then extermise "L" by them. I can't reach to a solution like "A" and I don't know where the problem is. I edited the maple file:

exfun2.mw

## clarification...

@tomleslie

I am soory for the late. at the maple file attached here I describe the procedure  step by step. I hope it has enough clarification.

Thank you for your time

## @tomleslie  First of all, I really...

First of all, I really appreciate your help.

I know what is happening physically but dont know how to translate to maple language.

let me try to explain what is happening there ,

we have a differential equation (3.3) ( i replaced theta by t ) , you solved numerically ( with your values for paramters M,l,C,Q,a,w) and find r against t diagram . now auther insert that in (3.2) then integrated  ( with theta_0=0.16 and r(0.159) ) and studied the relation between (3.2) and (2.6 T not t) that is figure 3 .

well how to find r(t) from your plot and integrate (3.2)

thank you for your help

## https://arxiv.org/abs/1512.08855...

actually this differential equation is equation 3.3 In the below paper which authors solved numerically..

https://arxiv.org/abs/1512.08855

## thanks for the point you indicated...

thanks for the point you indicated , it was really crucial point .

considering your point i did two example , i think i have problem with one of them.

example.mw

thanks in advance

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