deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 3d7f339..e1c7b6c 100644  --- a/untitled.tex  +++ b/untitled.tex 
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A_{11} & \cdots & A_{1n} \\  \vdots & \vdots & \vdots \\  A_{m1} & \cdots & A_{mn}  \end{array} \right]. \right]  = A.  \nonumber \end{equation}