Authorea features LaTeXML, the most powerful way to render LaTeX notation to the web. The continually updated list of packages supported by LaTeXML includes, at the time of writing, 286 class and style files. This is an up to date list.

In order to use a specific LaTeX package, you need to include it, so that Authorea loads it for you. For example, if you would like to type units, we suggest the siunitx package. In order to add it, follow these instructions:

Go to your Data folder and create a new file called header.tex . Edit it and add this line: \usepackage{siunitx}
Go back to the Main view and in a LaTeX block you can now type \si{\meter} which will render as m.
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