interacting gas with the same density of states at the chemical potential. The transition temperature of superfluid He 3 might therefore be taken to represent the scale of T$_{c}$ to be expected for a strongly interacting fermi-liquid away from criticality. The low energy properties are given by the Landau theory and thermodynamic and transport properties have been measured extensively. T$_{c}$/E$_{f}$ is about 10 − $^{3}$. Much is to be learnt from the work on this problem, not the least is why T$_{c}$ is so low. Variation of T$_{c}$ with pressure together with results of an interesting calculation by Patton and Zarnalingham [65] are shown in fig. (8). The general pairing vertex has been given in Eq. (2) and Fig.(2) in terms of the irreducible particle-particle vertex I$_{S}$ . The relation of I$_{S}$ ( k , k + q , k $^{′}$) to the Landau parameters is in- teresting to explore. With k , − k and k + q , k − q , all close to the fermi-surface, I$_{S}$ ( k , k + q ) is specified by I$_{S}$ ( θ, φ ), where θ is the angle between k$_{F}$ and k + q$_{F}$ and φ is the the angle between the planes formed by k , k + q and k $^{′}$, k ′ − q . For pairing, we need only I$_{S}$ ( π, φ ). The forward scattering limit q → 0 , ω → 0 of I are the province of the Landau theory of Fermi-liquids. The ”A” Landau interaction parameters are given by the forward scattering limit, ( v$_{f}$q ) /ω → 0, then ω → 0 of N (0) I$_{S}$ ( θ, φ ) = A$_{S}$ ( π, φ ). They are decomposed into different angular momentum channels: The forward scattering sum rule (imposed by Pauli-principle) requires Patton and Zarnalingham [65] argued that since the irreducible pairing vertex needs to be calculated in the limit ω/ ( v$_{F}$ q ) << 1, it should be related to the ”F” Landau parameters, which are in related to the irreducible vertex in the other limit, ω/ ( v$_{F}$ q ) → 0 and then q → 0. ”F’s” are related to the ”A’s” through The measured compressibility and the spin-susceptibility at various pressures provide F$_{0}$$_{,}$$_{0}$ and F$_{1}$$_{,}$$_{0}$ respectively as a function of pressure, while the specific heat provides F$_{0}$$_{,}$$_{1}$ . The Landau parameters are expected to rapidly decay with increasing ℓ due to the short-range ∑ s,ℓ A$_{s,ℓ}$ = 0 . (33) A ℓ S = A$_{S}$ ( π, φ ) P$_{ℓ}$ ( φ ) . (32) F$_{s,ℓ}$ = A$_{s,ℓ}$/ (1 + A$_{s,ℓ}$ ) (34) 35