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In section 3 of Einstein's "On the quantum theory of radiation" Einstein says equations (8) and (9) follow from (7) and Wien's displacement law. I don't see how that is. For example, if we replace (8) by

[tex]

\frac{A_m^n}{B_m^n} = \alpha \frac{\nu}{T} \nu^3

[/tex]

All conditions still seem to hold. What am I missing?

Also, can somebody point me to a derivation of Wien's displacement law that does not assume Planck's formula?

Thank you,

A_B

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# On the quantum theory of radiation

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