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\item In Langevin analysis (e.g. \citet{1975JFM....72..499H}) we define inertia and friction tensors $\mathbf{m}$ and $\mathbf\zeta$, which act on the derivative of the system's state vector $\mathbf{\dot x}$. What does it mean when these are symmetrical? What does it mean when they are diagonal?  \begin{itemize}  \item Apparently in Diagonalise the inertia tensor -- reduce the motion to its modes.   \item In  regimes far from equilibrium, $\mathbf\zeta$ stops being symmetrical. \end{itemize}  \end{itemize}