\(\displaystyle \left( {\begin{array}{*{20}{c}}

{{a_{11}}} & {{a_{12}}} \\

{{a_{21}}} & {{a_{22}}} \\

\end{array}} \right)\)

\(\displaystyle \sum\nolimits_{n = 1}^\infty {{n^2}} \)

\(\displaystyle \sum\nolimits_{n = 1}^\infty {{n^2}} \)

\(\displaystyle \sqrt {{a^2} + {b^2}} \)

\(\displaystyle \sqrt {{a^2} + {b^2}} \)

So mathml now works here, that's really useful.

not sure what's wrong with the tex version though.

{{a_{11}}} & {{a_{12}}} \\

{{a_{21}}} & {{a_{22}}} \\

\end{array}} \right)\)

\(\displaystyle \sum\nolimits_{n = 1}^\infty {{n^2}} \)

\(\displaystyle \sum\nolimits_{n = 1}^\infty {{n^2}} \)

\(\displaystyle \sqrt {{a^2} + {b^2}} \)

\(\displaystyle \sqrt {{a^2} + {b^2}} \)

So mathml now works here, that's really useful.

not sure what's wrong with the tex version though.

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