salim-barzani

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2 years, 86 days

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These are questions asked by salim-barzani

this is my first time something like that   coming up my equation after taking integral exponential coming up why?

g1.mw

the series is so complicated but have a strange pattern if you watch the index of parameter  they are not repeated 

 

 

How i can get FN from N-soliton to FN for M-lump by applying long wave method and using limit How we can get the series of lump , there is some example for nowing how lump work like f[2] for 1 lump and f[4] for two lump and f[6] for 3 lump i, and also in last of work i showed the series of for n soliton which we can change it to m-lump  but i don't know how work and a[12] will change to b[12] by applying long wave method

m-lump.mw

I did some example to change them but i didn't get the same result as book did it and i try to figure out by hand i get another result i know all of them are true but polar is for making the simple shap for ploting so How i can get the simple shape and if possible How do step by step like using totur we have for polar or not? 


 

> 

restart

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with(PDEtools)

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with(LinearAlgebra)

> 

NULL

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with(SolveTools)

> 

with(plots); with(plottools)

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with(VectorCalculus)

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with(Student:-LinearAlgebra)

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with(Student:-MultivariateCalculus)

> 

S := x^2+y^2-1

x^2+y^2-1

(1)
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convert(S, polar)

polar(abs(x^2+y^2-1), argument(x^2+y^2-1))

(2)
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ChangeOfVariables(S, [cartesian[x, y], polar[r, theta]])

r^2*cos(theta)^2+r^2*sin(theta)^2-1

(3)
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solve(%, r)

1, -1

(4)

 

 
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T := x^4+2*x^2*y^2+y^4+2*x^3+2*x*y^2-y^2

x^4+2*x^2*y^2+y^4+2*x^3+2*x*y^2-y^2

(5)
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ChangeOfVariables(T, [cartesian[x, y], polar[r, theta]])

r^4*cos(theta)^4+2*r^4*cos(theta)^2*sin(theta)^2+r^4*sin(theta)^4+2*r^3*cos(theta)^3+2*r^3*cos(theta)*sin(theta)^2-r^2*sin(theta)^2

(6)
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simplify(%)

r^2*(-sin(theta)^2+r*(r+2*cos(theta)))

(7)
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solve(%, r)

0, 0, -cos(theta)+(cos(theta)^2+sin(theta)^2)^(1/2), -cos(theta)-(cos(theta)^2+sin(theta)^2)^(1/2)

(8)
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R := -3*x^2+y^2-4*x-1

-3*x^2+y^2-4*x-1

(9)
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ChangeOfVariables(R, [cartesian[x, y], polar[r, theta]])

-3*r^2*cos(theta)^2+r^2*sin(theta)^2-4*r*cos(theta)-1

(10)
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simplify(%)

-4*r^2*cos(theta)^2-4*r*cos(theta)+r^2-1

(11)
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solve(%, r)

-1/(2*cos(theta)+1), -1/(2*cos(theta)-1)

(12)
> 

NULL


 

Download polar.mw

It been a while i try to figure out How they find dispersion parameter and phase shift i figure out how find dispersion in some of pde but some of them is not give me even dispresion parameter i don't know they wrong or i am , but for finding phase shift there is three cenarios, when we change pde to bilinear form we have linear term in bilinear form so after substitute in linear term f bilinear form we can get dispersion parameter which is a parameter beside (t) also we can generalized for all of solution by changing the number of parameter as mention in the paper, but for phase shift parameter i don't know how find it i must substitute our solution in linear term or whole  bilinear form of in first pde linear term i try all  but i don't know what is i did mistake the paper say put in pde but i think he mention the the bilinear form i did all part for one soliton is w[1] for 2soliton is w[2] file i just want find parameter a[12] in paper for 2-soliton eq(19)  then i will find for other just i need to find one of them, thanks for any help  in this topic .

 

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