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Expressing Feynman Green's function as a 4-momentum integral
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[QUOTE="realanswers, post: 6863495, member: 732455"] [B]Homework Statement:[/B] N/A [B]Relevant Equations:[/B] N/A [ATTACH type="full"]323435[/ATTACH] I am a bit confused on how we can just say that (z',p) form a 4-vector. In my head, four vectors are sacred objects that are Lorentz covariant, but now we introduced some new variable and say it forms a 4-vector with momentum. I understand that these are just integration variables but I still do not see how this is okay. The interpretation of z' now is different. [/QUOTE]
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Expressing Feynman Green's function as a 4-momentum integral
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