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%#!platex

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\documentclass{jarticle}
\usepackage{mathchm2} % ���낢��Ȑ���
\usepackage{graphicx} % �O���t�B�b�N�X
\pagestyle{empty}
\begin{document}
\Huge

\[
 \nabla \cdot \mathbf{u} = 0
\]

\[
 \frac{\partial \mathbf{u}}{\partial t} = -\mathbf{u} \cdot \nabla \mathbf{u}
  + \nu \nabla^2 \mathbf{u}-\frac{1}{\rho}\nabla p + \mathbf{g}
\]


\end{document}