I am having a problem with Rpres rendering math equations. Here is a sample of the problem:

built into a simple 1 slide Rpres presentation

Start with a sample, i.e. history, of returns \{\rho_i\}

and calculate \bar{\rho} and \bar{(\frac{1}{\rho})}\equiv\bar{\ell}.

For maximal gain:

None of equations render in the preview window, however, the generated html looks like this:

So, all the S ... $ equations render but the $$ f=\begin{cases} ... $$ does not render the equation.

In Rmarkdown presentations this is all works fine.

User error? Is there a way to get this working?