MathML

you can write equations in itex, and the wiki will render them via presentation MathML:

$$y=\left[\begin{array}{cc}1& 2\\ 3& 4\\ 5& 6\end{array}\right]$$

$$f\left(x\right)=\{\begin{array}{cc}1& \text{if}x\in rationals\\ 0& \text{if}x\in irrationals\end{array}$$

$$f\left(x\right)=(\begin{array}{cc}1& \text{if}x\in rationals\\ 0& \text{if}x\in irrationals\end{array}$$

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