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## Main Question or Discussion Point

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.

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

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