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The top part repeats the foregoing. In the lower part, we indicate how, in the Boltzmann-eqn. approach, the off-diagonal Peltier conductivity \alpha_{xy} may be written as the derivative of \sigma_{xy} with respect to energy (for a 2D Fermi Surface with anisotropic mfp, this general result may be derived using the geometric form of the Hall conductivity \sigma_{xy} [N.P. Ong, PRB 1992]). Similarly, the diagonal component \alpha may be written as the derivative of \sigma. Using these expressions in vN (previous page), we find that the two contributions to vN cancel exactly if \tau is independent of \epsilon.

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