deletions | additions       diff --git a/Swimmers.tex b/Swimmers.tex  index 17005ac..5cd3441 100644  --- a/Swimmers.tex  +++ b/Swimmers.tex 
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\begin{itemize}  \item Depends on whether the particle is charged or not: consider {\it uncharged} for now.  \item \citet{2010PhRvL.104m8302P}, \citet{1982JFM...117..107A}, \citet{onne_Ybert_Ajdari_Bocquet_2008}  \item An osmotic pressure gradient the interfacial layer leads to drift velocity $V_{\rm DP} = \mu\nabla c$.  \end{itemize}  \item {\it What are the statistics of this motion -- how much variance is there?} 
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\item {\it What does the scatter in trajectories tell us about the system?} Anything useful? Use linear-response theory (is this justified? Why?).  \end{enumerate}   \item {\itThen consider a single active swimmer in a concentration gradient.  Do we get a simplesuperposition simple superposition  of two behaviours?} \begin{itemize}  \item Re-read \citet{2005PhRvL..94v0801G}. Read \citet{2009JPCM...21t4104G}.  \end{itemize}