There exists very simple formula for Green function for wave equation:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] G(t,x,t',x') = \delta (t-t'\pm \frac{|x-x'|}{c})/|x-x'| [/tex].

I wonder whether there exist similiar formula for Green function

for Klein-Gordon equation (with mass >0) for any boundary condition.

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# Green function for KG equation

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