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We give a derivation of the dispersion law $\epsilon(p)=\hbar^2p^2/2m+\widetilde V(p)-\widetilde V(0)$, where $\widetilde V(p)$ is the Fouriertransform of the pair interaction potential $V(r)$. (The interaction betweenparticles $x_i$ and $x_j$ is $V(|x_i-x_j|)$.)

Dispersion Law of the Form $\epsilon(p)=\hbar^2p^2/2m +\widetilde  V(p)-\widetilde V(0)$ for Elementary Excitations of Nonideal Fermi Gas in the  Pair Interaction Approximation $(i\leftrightarrow j)$, $V(|x_i-x_j|)$