TeX

1.installation:

sudo apt-get install texlive texs­tu­dio

texlive: sys­tem

texs­tu­dio: edi­tor

2. sam­ple

\documentclass{article}
\begin{document}
$\pi=\sum\limits_{ij}^{n}{x_i}{x_j}{\pi_{ij}}$
\end{document}

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