In A. Zee's book "QFT in a Nutshell" he glosses over the idea that the path integral approach and the partition function are related loosely by the correspondence principle, and alludes to some deep fundamental insight behind QFT. But then he moves on. Anyone know where I could read up more on this?(adsbygoogle = window.adsbygoogle || []).push({});

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# Analytic Continutation of Quantum Statistical Mechanics

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