Some vertical marks won't work in MathJax.

equations latex mathjax websites

I had something like a | b that I wanted to use in MathJax. Usual latex will allow you to use |, but in my case, Markdown was interpreting the | as a table division when also using equation numbering.

Example of the failure:

$$a b$ \label{first eq}$

The workaround is easy – substitute in \vert for | and it works

$$a \vert b \label{secondeq}$$ produces:

\(a \vert b \label{second eq}\).

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