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\section{Readings and \section{Miscellaneous  Notes} Notes to myself about various \begin{itemize}   \item Renormalisation group good for  things with structure, where correlations between sites are important. Could be good for CLUSTERING investigation, especially if I can write down a Hamiltonian for the whole system composed of other particles (will certainly have  to read. simplify this a lot!).     \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 system's state vector $\mathbf x$. What does it mean when these are symmetrical? When they are diagonal?   \end{itemize}       Reading:  \begin{itemize}  \item Bertin 2009 \url{http://perso.ens-lyon.fr/eric.bertin/lecture_notes2009.pdf}. Section 2.5 on disordered systems.  \item \cite{2009arXiv0901.1271K}  \item Kurchan 1998 Fluctuation Theorem  \item \citet{2009PhRvL.102p0601B}  \end{itemize}     Miscellaneous stuff.   \begin{itemize}   \item Renormalisation group good for things with structure, where correlations between sites are important. Could be good for CLUSTERING investigation, especially if I can write down a Hamiltonian for the whole system composed of other particles (will certainly have to simplify this a lot!).     \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 system's state vector $\mathbf x$. What does it mean when these are symmetrical? When they are diagonal?   \end{itemize}