Inline math as in LaTeX:
...where $a=\int_{\Omega}fdx$ is an integral.
gets rendered as ...where \( a=\int_{\Omega}fdx \) is an integral.
An equation environment is surrounded by !bt and !et tags,
the rest is plain LaTeX:
!bt
\begin{align}
\frac{\partial u}{\partial t} &= \nabla^2 u,
label{a:eq}\\
\nabla\cdot\pmb{v} & = 0
label{b:eq}
\end{align}
!et
which is rendered as $$ \begin{align} \frac{\partial u}{\partial t} &= \nabla^2 u, \tag{5}\\ \nabla\cdot\pmb{v} & = 0 \tag{6} \end{align} $$
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