Abstract

In the paper the stability conditions for the ferromagnetic Fermi liquid are obtained from the microscopic approach. The stability conditions for the charged liquid are also discussed. The problem of renormalizations connected with the electron - phonon interaction is considered. In the final part of the paper we discuss the sum rule. All our formulae pass into the analogous ones for the paramagnetic liquid by a simple specification. The main parts of our formulae are valid only for a simple model with single band and spherical Fermi surfaces for both spins but there appear some formulae valid for an arbitrary band structure.

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