The symmetry factor of a Feynman diagram divides out permutations of indistinguishable internal lines and vertices that leave the labeled diagram unchanged. It is the order of the corresponding automorphism group after external labels are fixed.
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- Feynman rule
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- Four-leg vertex of a factorial-normalized scalar interaction
- Momentum-cutoff two-point function in six-dimensional cubic scalar theory
- One-loop proper vertices of massless phi-fourth theory
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