deletions | additions       diff --git a/Equation.tex b/Equation.tex  index 1639df0..92c1dc9 100644  --- a/Equation.tex  +++ b/Equation.tex 
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\begin{itemize}  \item $N$ is the number of civilizations in the Milky Way Galaxy with whom we could make contact.  \item $R$ is the rate of star formation (star/year), formation,  which tells how many stars are born every year in our Galaxy. \item $n_e$ is the average number of habitable planets in any planetary system  \end{itemize}  All the $f$ terms are factors $\le 1$, corresponding to