deletions | additions       diff --git a/text_xi__k_begin_equation__.tex b/text_xi__k_begin_equation__.tex  index be7a4a3..1eba66b 100644  --- a/text_xi__k_begin_equation__.tex  +++ b/text_xi__k_begin_equation__.tex 
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}  \begin{equation}  \label{sys1}  \left\{\begin{matrix} \left{\begin{matrix}  x_{k+1} = a\cdot x(k)+k\cdot sin(k) + \xi_{k}  \\   y_{k} = b\cdot x_{k}+\eta_{k}