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The statement that a property of a system does not change if the system is isolated.

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Parity conserving QFT

I was reading Peskin's QFT text and in Chapter 6 (Radiative Corrections), there is a line in section 6.2, page 185 which I am quoting below. The passage is about the $\Gamma^{\mu}(p^{'},p)$ and its de …
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