How can I include a Latex or Tex equation in my abstract??

Latex in abstracts is rendered using the Javascript frameword Mathjax. The Mathjax begin and end delimiters for inline equations are \$\$ and \$\$ The begin and end delimiters for block equations are both $$.

For example, \$\frac a b\$ yields $\frac a b$

And

\\[ \frac a b \\]
yields  \[ \frac a b \]