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Below is part of derivation of the Boltzmann equation in an electric and magnetic field.
I don't understand how to arrive at the bottom equation though. It is known that the dependence of the original distribution function is the given. My idea is to use chain rule but I don't see how to get a derivative of only ε.
I don't understand how to arrive at the bottom equation though. It is known that the dependence of the original distribution function is the given. My idea is to use chain rule but I don't see how to get a derivative of only ε.