As I understand it, the 2-point fnuction is for 1 particle incoming, 1 particle outgoing. The 4-point function is for 2 particles incoming, 2 particles outgoing. Is this correct? So an N-point function describes N/2 incoming particles and N/2 outgoing particles?(adsbygoogle = window.adsbygoogle || []).push({});

Thanks!

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# Difference between 2-point and 4-point function in QFT

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