deletions | additions       diff --git a/untitled.tex b/untitled.tex  index dc244a9..b11e48c 100644  --- a/untitled.tex  +++ b/untitled.tex 
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\begin{eqnarray}  D(Ax) &=& \left[ \frac{\partial (Ax)}{\partial x_1}, \dots, \frac{\partial (Ax)}{\partial x_n} \right] \nonumber\\  &=& \left[ \begin{array}{ccc}  \frac{\partial (Ax)_1}{\partial x_n} x_1}  & \cdot & \frac{\partial (Ax)_1}{\partial x_n} \\ \vdots & \vdots & \vdots \\  \frac{\partial (Ax)_m}{\partial x_1} &\cdot & \cdot  & \frac{\partial (Ax)_m}{\partial x_n} \end{array} \right]  \end{eqnarray}