# Fourier Transform of a productof Green functions

1. Jan 26, 2010

Guys, how do u get the fourier transform of a product of Greens Functions?I have to get fourier transform of:

G$$_{el}$$(k+q,$$\tau$$-$$\tau1$$)*G$$_{el}$$(k,$$\tau1$$) where $$\tau$$ and $$\tau1$$ are two different times ($$\tau$$>$$\tau1$$) and q is phonon momentum and k is electron momentum....

Thanks

2. Jan 26, 2010

### SpectraCat

*cough* homework problem *cough*

....

*cough* convolution theorem *cough*