deletions | additions       diff --git a/Mixing work.tex b/Mixing work.tex  index 4767efb..36938f0 100644  --- a/Mixing work.tex  +++ b/Mixing work.tex 
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To do:  \begin{itemize}  \item Extension to non-ideal beyond ideal  gas? -- Hard!   \item Extension to arbitrary initial particle numbers Hard,  and volumes. -- Useful for understanding where entropy comes from.   \item Re-visit point \ref{pnt:mixwork}. perhaps not much to learn from the exercise.  \end{itemize}