(8.24) |

and

(8.25) |

The first property guarantees that the equilibrium distribution is not changed by the scattering. The second property was already discussed in Section 8.3. It is necessary for conservation of mass, i.e., scattering only redistributes the carriers between different states . Inscattering and outscattering cancel in total. It is straightforward to see that both properties hold also in the discrete case.

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