Fourier Transform
This covers how to convert integrals and products in real space to expressions in Fourier space. It's useful to know especially when one covers
Green's Functions and you want to translate GF rules from position space to momentum space. It's also relevant to solving integral equations with
translationally invarient kernels. So if you find yourself in the Integral Equations folder, and wonder where a solution came from, it might be here.
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