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Apr 2 at 22:30 comment added CBBAM I have come across this post while searching for why computing the 2-point function of a free quantum field theory is the same as finding a Green's function for the equations of motion. I suppose this answer is the rigorous justification for that or is there more to it?
Feb 22, 2016 at 17:20 vote accept David Roberts
Feb 22, 2016 at 15:06 history edited Carlo Beenakker CC BY-SA 3.0
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Feb 22, 2016 at 14:42 history edited Carlo Beenakker CC BY-SA 3.0
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Feb 22, 2016 at 14:35 history answered Carlo Beenakker CC BY-SA 3.0