deletions | additions       diff --git a/untitled.tex b/untitled.tex  index 20daa90..497f490 100644  --- a/untitled.tex  +++ b/untitled.tex 
...
&x_{t+1}=x_{t}+a*t+6.9+E_{t}&\\  &z_{t}=x_{t}+N_{t}&   \end{eqnarray}  A = \begin{pmatrix}  a_{11} & a_{12} & \cdots & a_{1n} \\  a_{21} & a_{22} & \cdots & a_{2n} \\   \vdots & \vdots & \ddots & \vdots \\  a_{n1} & a_{n2} & \cdots & a_{nn}  \end{pmatrix}