$$\fracdjd\ln D = - 2 j^2 + 2 j^3 + \dots$$
The Renormalization Group: From Critical Phenomena to the Kondo Problem $$\fracdjd\ln D = - 2 j^2 + 2
$$\rho(T) = \rho_0 \left[ 1 + 2 J \rho(\epsilon_F) \ln\left(\fracDT\right) + \dots \right]$$ $$\fracdjd\ln D = - 2 j^2 + 2
$$T_K \sim D \exp\left(-\frac1J\rho(\epsilon_F)\right)$$ $$\fracdjd\ln D = - 2 j^2 + 2