deletions | additions       diff --git a/i equivalent.tex b/i equivalent.tex  index 9e36e96..2057ef8 100644  --- a/i equivalent.tex  +++ b/i equivalent.tex 
...
=\begin{bmatrix} b & a \\ d & c\end{bmatrix}  Nope just ends up at $-1$ equivalence  \end{equation}