https://github.com/alexandregiordanelli
$$
\frac{d T}{dt} = {\partial T \over \partial t}
$$
$$
\begin{align}
1 + 0 & = 1, \label{eq1} \\
1 + 1 & = 2. \label{eq2}
\end{align}
$$
$$
\begin{align}
\frac{d T}{dt} & = {\partial T \over \partial t} +
{\partial T \over \partial x} {dx \over dt} +
{\partial T \over \partial y} {dy \over dt} +
{\partial T \over \partial z} {dz \over dt} \\
& = {\partial T \over \partial t} +
{\partial T \over \partial x} u +
{\partial T \over \partial y} v +
{\partial T \over \partial z} w \\
& = {\partial T \over \partial t} + V \nabla · T
\end{align}
$$