<script type="text/javascript"

src="http://www.maths.nottingham.ac.uk/personal/drw/LaTeXMathML.js">

</script>

Suddenly, I can type (almost) anything in latex, e.g. \$a_n\$ becomes $a_n$. Fancy!

(If you do not see anything fancy then either Javascript is disabled in your browser or you are using Internet Explorer without MathML support. In the latter case you may want to download MathPlayer by DesignScience.)

Many thanks for Peter Jipsen the folks who developed ASCIIMathML, which serves as the basis of LaTeXMathML by Douglas R. Woodall. Examples showing what is possible with LatexMathML can be found here. This is an indispensable tool!

The nice thing is that MathML is scaleable:

$E=m c^2$