deletions | additions       diff --git a/subsection_applying_information_theory_to__.tex b/subsection_applying_information_theory_to__.tex  index 6955dfc..c26218c 100644  --- a/subsection_applying_information_theory_to__.tex  +++ b/subsection_applying_information_theory_to__.tex 
...
\]  The changes in velocity follow from the water hammer equations. Thus, if we know the wave speed in the artery we can separate the measured changes in pressure into its forward and backward components.  We observe that for a known value of $\rho c$ we have an simple invertible map from $[dP, \rho c dU] \leftrightarrow [dP_+, dP_-]$ dP_-]$.