Abstract
A radiative transfer equation is derived which is sufficiently general to apply to energy transfer by various types of wave motion, such as electromagnetic waves, sound waves, hydromagnetic waves, etc. Scattering of waves is neglected. The equation is compared to the equation found in the literature of radio astronomy, and the meaning of a term in this equation is clarified. The general solution of the equation is given. A more rigorous derivation of the transfer equation based on a method due to Wigner is given.

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