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## Main Question or Discussion Point

I want deduc vertex of the lagrangian, but I not know how?

- Thread starter ElianeUnifei
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I want deduc vertex of the lagrangian, but I not know how?

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To calculate the associated Feynman rule just keep the term add an "i" and remove the fields. If you have a vertex with 3 or 4 vector bosons the Feynman rule is bit more complicated because you have to take into account the different ways in which they can interact. Check it out for example in Peskin pag 507.

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