In peskin p. 192, they says that the denominator (that is equation 6.43) is symmetric under x<--> y. Thay all so say that you can see it in equation 6.44.(adsbygoogle = window.adsbygoogle || []).push({});

But one of the terms in the denominetor is y*q wich dose not have that symmetry!

Looking at (6.43) and removing the summetric parts leave me with

2yk⋅q +yq^{2}.

Whitch is not x<-->y symmetric.

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# Symmetry in integrals

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