I've been doing some review of particle physics in Griffiths and I came across this statement that really didn't stand out to me before.(adsbygoogle = window.adsbygoogle || []).push({});

"the idea is to draw all the diagrams contributing to the process in question (up to a desired order), calculate the amplitude (M) for each one, and add them up to get the total amplitude"

I would like to know what is the significance of the "up to a desired order" statement? I've read in books about quantum field theory that the idea is we are actually using a perturbation procedure in the Feynman diagram formalism. Is there any evidence to that claim or am I confusing it with something else?

Or instead is the order of a process just have to do with the number of external/internal lines in a diagram?

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# Significance of Order in Feynman Diagrams

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