deletions | additions       diff --git a/Payam.tex b/Payam.tex  index 7530a20..cb26d31 100644  --- a/Payam.tex  +++ b/Payam.tex 
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\citet{nderson_Mitchell_Bartlett_2002}: high-speed observations of two interacting colloids. Sonic effects.\\  \citet{Padding_Louis_2006} coarse-graining approach; Langevin does a poor job.  \item {\it  Does Payam assume incompressible flow somewhere flow?} I believe so  -- e.g. when he follows Landau \& Lifshitz in  setting up the thin jet equations? submerged jet; and I believe they assume zero divergence in the velocity field.  (Note that thesubmerged jet  derivation in \citet{Broman_Rudenko_2010} assumes incompressibility.) \item (Sound speed shouldn't depend on viscosity at except for near-supersonic flow. (\href{http://iopscience.iop.org/0370-1301/66/5/303/pdf/0370-1301_66_5_303.pdf}{Or does it?} \href{http://www.engineeringtoolbox.com/sound-speed-water-d_598.html}{Speed of sound table}, \href{http://resource.npl.co.uk/acoustics/techguides/soundpurewater/content.html#LUBBERS}{$c(T,P)$ fits}.))