deletions | additions       diff --git a/section_Introduction_label_sec_introduction__.tex b/section_Introduction_label_sec_introduction__.tex  index 5bfea55..080aa75 100644  --- a/section_Introduction_label_sec_introduction__.tex  +++ b/section_Introduction_label_sec_introduction__.tex 
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1+2=3  \end{equation}  \begin{equation}  b = \frac{a}{b}  \end{equation}  ...and here we refer to Eq. \ref{eqn:eq_1} to see if it works.  And, how about referring to Section \ref{sec:introduction}?