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I want to solve a differential equation which goes like this..

[itex]\nabla^{2}\psi = A\psi[/itex]

For an annulus having inner diameter as a and outer diameter as b. (A is some constant)

I can write down the laplacian in polar co-ordinates and carry on and get a bessel function as the solution.. And then apply the boundary conditions that at r=a and r=b [itex]\psi = 0[/itex]

Will this do? Or will i have to incorporate the structure of the annulus in the equation like making a co-ordinate transform from r to r-a etc..

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# Differential equation in Annulus

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