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Hi all.

I'm learning something about critical phenomena and I have one problem.

I'm bad with Fourier transforms so I don't know how from 7.37 we have 7.38.

I have tryed everything I knew, but fruitless. I have attached picture of my problem.

Does anybody has any idea how I can solve this?

I'm learning something about critical phenomena and I have one problem.

I'm bad with Fourier transforms so I don't know how from 7.37 we have 7.38.

I have tryed everything I knew, but fruitless. I have attached picture of my problem.

Does anybody has any idea how I can solve this?