Display LaTeX in GitHub Markdown
See here for the original answer.
The fix to this is to escape your underscore characters, as they are currently being interpreted as italics instead of as part of the mathematical equation:
1. First she must calculate the inverse of $e \ (d)$ in $\mathbb{Z}\_{1440}$. Recall that $e$ has an inverse in $\mathbb{Z}\_{n}$ if $e$ * $e^{-1} \equiv 1 \ mod \ n$. This is easily done using Euclidian's algorithm. <br>
Example of this rendered in the GitHub markdown editor:
