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In doing my [tex]\phi^{3}[/tex] theory I didn't know exactly how to count the number of loops in a diagram given the number of vertices, internal and external lines. Is there a general algorithm in doing this? What if we have more than one interaction vertex (e.g. the Standard Model)?
PS. What does it mean when it says my thread has been "moved"?
PS. What does it mean when it says my thread has been "moved"?