deletions | additions       diff --git a/Appendix.tex b/Appendix.tex  index 5f1b91c..e303910 100644  --- a/Appendix.tex  +++ b/Appendix.tex 
...
\section{Appendix}  The electron cyclotron frequency is given by \[\omega_{ce}=\frac{eB}{m_e}\] where $e$ is the elementary charge, $B$ is the magnetic field and $m_e$ is the electron mass.  The plasma frequency is given by \[\omega_{pe}=\sqrt{\frac{ne^2}{m\epsilon_0}}\] \[\omega_{pe}=\sqrt{\frac{ne^2}{m_{e}\epsilon_0}}\]  where $n$ is the plasma density,and $\epsilon_0$ is the permittivity of free space.