without latex delimiters the `_{i=1}` in `\sum_{i=1}^n a_n` is interpreted as subscript. we support `\(...\)`, `\[...\]`, `$$...$$` and `\begin{$env}...\end{$env}` as latex fragment delimiters.

- ∑i=1^n a_n (without latex delimiter)
- \(\sum_{i=1}^n a_n\)
- \[\sum_{i=1}^n a_n\]
- $$\sum_{i=1}^n a_n$$
- \begin{xyz}\sum_{i=1}^n a_n\end{xyz}
- \begin{xyz} \sum_{i=1}^n a_n \end{xyz}
- $2 + 2$, $3 - 3$
- \begin{xyz} latex block ignores block lvl elements (e.g. list - line starting with -) a = b - c - d \end{xyz}