Furry's theorem (Q26877569)

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theorem in quantum physics that, in a theory preserving charge conjugation symmetry, a Feynman diagram consisting of a closed fermion loop connected to an odd number of vertices integrates to zero
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Furry's theorem
theorem in quantum physics that, in a theory preserving charge conjugation symmetry, a Feynman diagram consisting of a closed fermion loop connected to an odd number of vertices integrates to zero

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    Triangle diagram.svg
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    example of a diagram whose contribution vanishes due to Furry’s theorem (English)
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