Abstract
This lecture focuses on the fluctuation-dissipation theorem and its generalizations to the non-equilibrium case, in particular to stationary regimes. The well-known equilibrium relationship between response coefficients and correlations is generalized to stationary regimes, introducing additional terms such as frenzy. The lecture continued with demonstrations of the fluctuation-dissipation relationship between conductivity and current fluctuations and Onsager's reciprocity relations.
