This is LaTeX code:
[latex]
\vec a \times \vec b = \left[\begin{array}{ccc} 0&-a_3&a_2\\ a_3&0&-a_1\\ -a_2&a_1&0 \end{array}\right]\left[\begin{array}{ccc} b_1\\ b_2\\ b_3 \end{array}\right]
[/latex]