As far as I understand now, there are at least three different formulations of QFT:(adsbygoogle = window.adsbygoogle || []).push({});

1) Second Quantization

2) Functional Formulation(where there is wave-functional which is a function of the field configuration and satisfies a functional Schrodinger equation)

3) Path Integral

Is there any other formulation out there?

Also, I know that QFT textbooks usually treat QED using second quantization and then turn to path integrals for non-abelian gauge theories(except for Bailin and Love that uses path integrals throughout). But the only textbook I know that spends some time on the functional formulation is Hatfield. Is there any other textbook that develops the functional formulation and uses it to calculate any physical quantity?

Thanks

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# A Different formulations of QFT

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