There's a language for it (LaTeX).

It looks like this:

\int_{-\infty}^{\infty} e^{-x^2}\,dx = \sqrt{\pi}

Thank's, i was wondering if people were typing this latex by hand, or with a specialized visual editor.

	▲	Garlef 6 hours ago \| parent \| next [-]
		both, of course :) i prefer to do it by hand (and in some environments you can also define aliases/macros so that the different constructs you're dealing with are typeset consistently and you don't have to re-type everything)
	▲	beerglass 2 days ago \| parent \| prev [-]
		Update: added an insert-equation button in the toolbar of my MD Viewer