# On the quantum theory of radiation

by A_B
 P: 85 Hi, 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 $$\frac{A_m^n}{B_m^n} = \alpha \frac{\nu}{T} \nu^3$$ 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