This is more of a math question than a physics one, but following the discussion of the propagator in Zee's book:(adsbygoogle = window.adsbygoogle || []).push({});

-(∂^{2}+m^{2})D(x-y)=δ(x-y)

he then gets, by taking the Fourier transform of the Dirac delta and dividing through:

D(x-y) = [itex]\int\frac{d^4k}{2π^4} \frac{e^{ik(x-y)}}{k^2-m^2+iε}[/itex]

I get the FT and adding iε to avoid a pole, but not how you take

D(x-y)= -(∂^{2}+m^{2})^{-1}[itex]\int\frac{d^4k}{2π^4} e^{ik(x-y)}[/itex]

and change the differential operator outside the integral to [itex]1/ (k^2-m^2) [/itex] inside it

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# Help deriving propagator

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