[O] Latex export with \begin{equation}

[Dominik Schrempf]

Hi,

I have the following document:
\begin{equation}
foobar
\end{equation}

I perform an HTML export.

The equation is not rendered with MathJax when using Org Mode 9.1.14
(Spacemacs).

The equation is correctly rendered with =emacs -Q=; then, Org Mode 9.1.9 is 
used.

I am sure that Spacemacs sets other variables that may influence the HTML
export, but even then LaTeX export works perfectly when using dollar signs to
mark the equation.

Help much appreciated!

Thanks,
Dominik