FIG. 10: T$_{c}$ vs. T$_{0}$ , a measure of the Fermi-energy obtained from magnetic susceptibility measure- ments from several heavy-fermion superconductors as well as Cuprates; figure is reproduced from Ref.(67). qualitativ ely different from that in liquid He $^{3}$. The renormalizations are c haracteristic of a sub-set of fermi-liquids in which the single-paricle self-energy is very weakly dependent on momentum compared to on energy. This idea gives that [68] m $^{∗}$/m = 1 /z = (1 + F s $_{0}$) (36) κ/κ 0 = ( m $^{∗}$/m ) / (1 + F s $_{0}$) = O (1) χ/χ$_{0}$ = ( m $^{∗}$/m ) / (1 + F a $_{0}$) = O (1) . The enhancement of the specific heat of O (10 $^{3}$) gives z of O (10 − $^{3}$); similar enhancement of susceptibility gives F a 0 of O (1); the lack of renormalizations in ultrasonic attenuation and zero-temperature resistivity give that F s 0 ≈ 1 /z . The temperature dependence of the resistivity in the Fermi-liquid regime is ∝ T 2 with its coefficient renormalized by O (1 /z $^{2}$) which also follows from the momentum independence of the self-energy. These ideas are also 40