deletions | additions       diff --git a/Equation.tex b/Equation.tex  index d113af0..322c54b 100644  --- a/Equation.tex  +++ b/Equation.tex 
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$N = R \times f_p \times n_e \times f_l \times f_i \times f_c \times L$  where $N$ is the number of civilizations in the Milky Way Galaxy with whom we could make contact.  $R$ is the rate of star formation, which tells how many stars are born every year in our Galaxy.   All  $f$ termn  areall  factors $\le 1$ 1$, corresponding to