I have seen some documentation here on how to include LaTeX in Confluence, but looking at the docs linked I am not clear on what I should expect to work out of the box and what needs a plugin from the Atlassian marketplace.
For example, I'd like to include the symbol sigma (Σ) in a confluence document. Looking at the link I'd expect {\Sigma} to create the Greek capital letter Sigma but it gives me a "Wiki Markup" entry rather than inline LaTeX. Any ideas what I am doing wrong here?
When you type the left opening brace ({) in the editor, an auto-complete suggestion list should appear. If you type latex, you should see the options available to you. Alternatively, you can click the add button in the top right of the editor ribbon, and select the LaTeX macro you want; inline, block, reference, etc.
That should open an editor window where you would type \Sigma or whatever body you want the macro to have.
If you type {\Sigma}, Confluence looks for a macro called \Sigma, fails to find one, so it defaults to Wiki Markup.