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in Schwartz's QFT-book it says that:

"Classically, a box of size L supports standing electromagnetic waves with angular frequencies [itex]\omega_n = \frac{2\pi}{L}\left|\vec{n}\right|c [/itex] (...)"

I wonder if the factor 2 is really correct, I only get this factor 2 if I suppose that eg. for the wavelength in x-direction the possible values are [itex]L = n\lambda_{x,n}[/itex], however I would expect that [itex]L = n\lambda_{x,n}/2[/itex].

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# Blackbody radiation

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