= Eliashberg theory
{c}
<Eliashberg theory> retains the <frequency> dependence of the <electron>–<phonon> interaction and the normal and anomalous electronic self-energies in a strong-coupling treatment of conventional <superconductivity>. The <phonon> <spectral function> $\alpha^2F(\omega)$ and a screened Coulomb pseudopotential enter the pairing equations. High <phonon> <frequencies> alone do not specify a transition <temperature> without the coupling strength and competing repulsion.
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