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\section{Mechanisms of scattering in crystals}  Assuming that the electrons in the crystal can described as a  Fermi liquid Liquid , the  theory guarantees (as one of its assumptions)  weakly interacting particles. So, Drude correct particles  in metals. the form of the Landau quasiparticles.  Impurity, electron electron (umklapp) and electron phonon scattering \subsection{Electron-electron scattering}     \subsection