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## Homework Statement

## Homework Equations

Show that the KG propagator

[tex] G_F (x) = \int \frac{d^4p}{(2\pi)^4} e^{-ip.x} \frac{1}{p^2-m^2+i\epsilon} [/tex]

satsify

[tex](\square + m^2) G_F (x) = -\delta(x) [/tex]

## The Attempt at a Solution

I get

[tex](\square + m^2) G_F (x) = - \int \frac{d^4p}{(2\pi)^4} (p^2-m^2) e^{-ip.x} \frac{1}{p^2-m^2+i\epsilon} [/tex]

but where do I go from there?

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