Is There a Simple Formula for the Green Function of the Klein-Gordon Equation?

paweld
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There exists very simple formula for Green function for wave equation:
G(t,x,t',x') = \delta (t-t'\pm \frac{|x-x'|}{c})/|x-x'|.
I wonder whether there exist similar formula for Green function
for Klein-Gordon equation (with mass >0) for any boundary condition.
 
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Thread 'Direction Fields and Isoclines'

Thread 'Direction Fields and Isoclines'

I sketched the isoclines for $$ m=-1,0,1,2 $$. Since both $$ \frac{dy}{dx} $$ and $$ D_{y} \frac{dy}{dx} $$ are continuous on the square region R defined by $$ -4\leq x \leq 4, -4 \leq y \leq 4 $$ the existence and uniqueness theorem guarantees that if we pick a point in the interior that lies on an isocline there will be a unique differentiable function (solution) passing through that point. I understand that a solution exists but I unsure how to actually sketch it. For example, consider a...
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