[NTG-context] Matrices LaTeX -> ContTeXt

[Jilani Khaldi]

Hi All,
how tow write these matrices in Context?

% []
\begin{bmatrix}
1&2\\
3&4
\end{bmatrix}

% {}
\begin{Bmatrix}
1&2\\
3&4
\end{Bmatrix}

Thanks!

jk