@jeremydouglass has recently enabled MathJax for this forum. MathJax allows formulae to be shown as if written in a maths context. So something like
x^4+y^3-x^2*y=0 can be displayed inline like this x^4+y^3-x^2*y=0 or displayed like this
For simple formulae simply enclose the equation between dollar signs $…$ to make it inline with text or display by gating with $$…$$ e.g.
If you want to use the dollar symbol in your discussion then you need to put back-slash in front like this
\$. In this context the backslash is called the escape character and says that the character immediately following should be treated literally.
For more complicated formulae there is a sophisticated markup which I will try and demonstrate here when I get a chance but this guide looks quite good.
EDIT: the this post has been edited based on comments regarding the double dollar syntax provided by @jeremydouglass in the next post.