iPad Playground Equation Formatting

[nteissler]

Platform: iPad Playground (iPad Pro 10.5")
Version: 1.0 (2017-06-02)
Issue: LaTeX-Like Typset Rendering
Description: All text embedded between $s does not render as an equation. I'm not sure if this is a deficiency in playgrounds, or an error.

Sample

This is from the SortedArray page, but the rendering seems to fail throughout the book