deletions | additions       diff --git a/As_a_brief_introduction_the__.tex b/As_a_brief_introduction_the__.tex  index e5fe7a8..c77e975 100644  --- a/As_a_brief_introduction_the__.tex  +++ b/As_a_brief_introduction_the__.tex 
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As a brief introduction, the Structure Function describes the average of the square of the difference in intensity between the light received from one position (from a source moving at a certain speed toward / away from the observer) and light received from another position (from a source that may be moving at a different speed).\\  For a slightly less ugly description, the Structure Function is as follows:\\  \ $S_2 = &=  $ \begin{flushleft}  \begin{align*}  1 + 2 &= 3\\