Do the Fourier coefficients of an interacting field obey the commutation relations? I think I was able to show once that they do if the Fourier coefficients are taken at equal times (the coefficients are time-dependent in the interacting theory), but my proof felt shaky.(adsbygoogle = window.adsbygoogle || []).push({});

In any case, does anyone know the answer for equal times, or unequal times?

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# Do commutators hold in interacting theory?

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