### Usage of SBAbook LaTeX Class

Source: https://github.com/squarebracketassociates/polymath-book/blob/master/sbabook/README.markdown

Demonstrates the basic usage of the SBAbook LaTeX class. It shows the minimal preamble required to start a document and specifies the need for `setmainlanguage` with `polyglossia`. The class requires LuaLaTeX for compilation.

```latex
\documentclass{sbabook}
\setmainlanguage{english} % this is polyglossia, not babel
\begin{document}

...and off you go!

\end{document}
```

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