I wish an easy way to communicate mathematical equations with gmail.
There\'s a javascript script called AsciiMath, which should translate Tex-like equations into standa
As far as I can figure out, GmailTeX (suggested in the top answer) does not work in Firefox anymore.
I can suggest the browser plugin MathQuill for Gmail (also exists for Chrome), which allows to edit formulas within the Gmail compose window, and converts them into pictures. (Like GmailTeX in concept, but with an interactive editor.)
Disclaimer: I am the author of the plugin.