deletions | additions       diff --git a/DeclareMathOperator_div_div_section_subsection__.tex b/DeclareMathOperator_div_div_section_subsection__.tex  index c11d190..6d8aa99 100644  --- a/DeclareMathOperator_div_div_section_subsection__.tex  +++ b/DeclareMathOperator_div_div_section_subsection__.tex 
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\label{eq_continuity}  \frac{d\rho}{dt} + \rho \div \boldsymbol u = 0  \end{equation}  Подставив в уравнение сплошности неразрывности  \eqref{eq_continuity} условие нулевой дивергенции \eqref{eq_div} и получим, что \begin{equation}  \label{eq_density_conservation}  \frac{d\rho}{dt} = 0