Thanks to the wonderful MathJax plugin, it is very easy to embed equations into CVX Forum posts. Support for most LaTeX and AMS-LaTeX constructs are included.
To embed an inline equation, just surround the equation in dollar signs. For example, typing
$x+y\leq z$ yields x+y\leq z.
Centered equations are supported as well by surrounding them with two dollar signs. For instance:
When editing a post, a live preview window will show you how the equations render, so you can confirm that what you intend will show in the final post. However, once you have submitted your post, you may find that MathJax does not render the equations, leaving the raw source code on screen. Just refresh your browser to see the results.