deletions | additions       diff --git a/Complex.tex b/Complex.tex  index c4968f2..d86c8fb 100644  --- a/Complex.tex  +++ b/Complex.tex 
...
\mat{a}{b}{c}{d}^{-1}=\frac{1}{ac+bd}\mat{c}{c}{b}{-b}  \end{equation}  Which is very curious as it only relies on all of the elements weakly in the form of a coefficient. Even more odd is the fact that for the idenity matrix, whose cross inverse is clearly the hash identity, using the above formula leads to a definition of  an undefined quantity, \begin{equation} \frac{1}{0}\mat{0}{0}{0}{0} = \mat{1}{0}{1}{0}