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.

- \sum_{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}
- $2 + 2$, $3 - 3$
