I would like to clearify the connection between n-point functions, Feynman diagrams and S-matrix.(adsbygoogle = window.adsbygoogle || []).push({});

I do not want ( yet) to understand the detailed derivation of the LSZ reduction formula, just the rough connection between the n-point function on the one side and the S- matrix on the other side.

They say that the n-point function ( of an interacting theory) is the sum of all possible Feynman diagrams. What then do single Feynman graphs correspond to? Elements of the S-matrix? If so, how?

Thank you

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# Feynman diagrams

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