deletions | additions       diff --git a/text_xi__k_begin_equation__.tex b/text_xi__k_begin_equation__.tex  index 9770118..9cfa1bd 100644  --- a/text_xi__k_begin_equation__.tex  +++ b/text_xi__k_begin_equation__.tex 
...
\end{equation}  \text {  $\xi_k$ \xi_{k}  - ошибка модели (случайная величина), }