In QFT, the commutation relation for the field operator [itex]\hat{\phi}[/itex] and conjugate momentum is(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

[\phi(x,t),\pi(y,t)] = i\delta(x-y)

[/tex]

Maybe this is obvious, but what would the commutator of [itex]\phi[/itex] or [itex]\pi[/itex] and, say, [itex]e^{i k\cdot x}[/itex] be?

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# A Commutator of field operator with arbitrary functions

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