Hello, world!


HELLO, WORLD!

This is MathJax: $E=mc^2$ and

$$
\begin{equation}
L =
\begin{cases}
1 & \text{if $i = j$ and $deg_j \neq 0 $} \\
stuff & \text{if $(i, j) \in E$} \\
0 & \text{otherwise}
\end{cases}
\end{equation}
$$
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