Abstract
The Pauli principle sum rule is violated if the interaction of quasiparticles in Landau's theory of normal Fermi liquids is calculated by functional differentiation of the binding energy obtained by Brueckner's method. The reason is the unsymmetrical treatment of particles and holes in Brueckner's theory. The fact that the phenomenologically determined values of Migdal's parameters also violate the sum rule is discussed.
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