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WarnK
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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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