On page 12 of Zee's QFT in a nutshell, he rewrites an integral from dirac notation to a mixture of schrodinger/dirac(adsbygoogle = window.adsbygoogle || []).push({});

My question is, since , what happened to the integrals, and shouldn't there be four wave functions instead of two?

I tried writing out the integrals explicitly, thinking maybe theyre integrated out with a delta function or something, but with no luck - I don't see how to get to psi(q_f).

Any help would be appreciated.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Zee QFT Derivation Question

Loading...

**Physics Forums | Science Articles, Homework Help, Discussion**