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I can't understand where this formula ((8.5), Rössler, Solid State Theory, Springer) comes from (see attached file).

The label l stands for the electrons positions and c and c dagger are the free electron creation and annihilation operator. This expression is used to write the linear term in the perturbative expansion of the electron-phonon coupling in second quantization.

Thank you in advance.

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# Second quantisation formula (electron-phonon coupling)

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